UCTRONICS 19” 1U Rack Mount for Raspberry Pi with SSD Mounting Brackets, Thumbscrews Front Removable Bracket Supports Up to 4 Raspberry Pi 5, 3B/3B+, 4B and 4 SSDs, Option SD Card Adapter

This is perfect for my raspberry pies I wanted to make a pie cluster in my home server setup. I'm very affordable for what it is easy to set up it fit my rack and the quality and size were perfect

Really like this. Works so well!

I like this mount a lot except that there is very little space on either side of the RPi for cable attachment. You will definitely need right angle adapters to connect most cables.

Very nice way to organize your pi's. Works well in our environment with a standard size rack. One thing I would absolutely recommend is finding some cables that work at a right angle. Makes things much easier to organize and fit together. Overall, a good value for the right situation. Little lighter than what I wanted but it seems to be holding up overall.

I just installed four Pis in this case. While the case is designed for the Pi 4 B, the Pi 3 B and 2 B fit in it, too and I suspect the four-USB-port Pi 1 B+ will fit into it too. (The original Pi 1 probably fits too, but would have some empty space around the USB ports.) The boards mount securely to little daughter cases using supplied screws (mine came with two more than the sixteen required). On the bottom of each daughter case is room for a 2.5" hard disk or solid state drive, and screws are supplied for this as well. You'd need to supply your own USB 3.0-to-SATA-and-power cable/interface, and you'd need to ensure that your power supply had enough amperage to properly power both the Pi and drive, but this is a nice touch. The four daughter cases connect to the main rack-mountable portion using thumb screws that also have Phillips heads in them, in case you need help loosening them. Running the power cables to the Pis is a bit tricky, so you may want to connect them before you put the whole thing into your rack. The status LEDs of the Pis will be invisible using this case, since they'll be inside the rack, but the Ethernet ports are fully exposed at the front of the case, along with the USB ports. You can, of course, see the network traffic LEDs easily from the front, so have a pretty good idea if your Pis are functioning okay. There is limited space to label anything, but I was able to put some labeling machine labels on the case vertically with machine names, so I know which is which. This is a nice case. It's not super inexpensive, but as rack-mount stuff go, it's reasonably priced, and it's certainly thoughtfully designed. I would buy it again (and may get another yet).

Rack is perfect for my needs. On the tray that you install the Raspberry Pi onto, there is a space on the bottom of the tray for a 2.5" SSD. I recommend you stick with a 7mm drive, a 9mm drive will most likely not allow tall Pi Hats from fitting through the opening the tray is screwed into. On the top of the tray, there is a place for a SD extender that UCTRONICS sells. So you will want to install it first if you are planning on using this. You can then install the Raspberry Pi onto the stands of the tray. The Official Raspberry Pi POE+ HAT comes with M2.5x9mm stands. If you want to use this HAT, you will need to purchase M2.5x9mm stands. From another review, you can look for this item in Amazon, "uxcell M2.5x9mm+6mm Male-Female Brass Hex PCB Motherboard Spacer Standoff for FPV Drone Quadcopter, Computer & Circuit Board 20pcs", and it will work perfectly. However, it isn't the only one item, you just have to find it. Once everything is attached to the tray, you can just slide it in with no issue to the rack. There was more then enough room to slide the tray in and out with the Official POE+ HAT attached. However, this is if you use a 7mm SSD. Anything more and there is no guarantee that everything will fit through the opening. So be warned if you are planning on using SSD that is thicker than 7mm.

Nice 1U panel that holds 4 RPIs. My Pi's are mounted safe and secure! The thumb screws are a really nice addition. They're mounted to the frame that slides into the rack and are spring loaded. It's nice to not have to worry about loosing these or them shooting across the floor if you drop one. The fit is tight and right. Everything fits perfectly. I have a Pi4b and two Pi5's loaded in the rack now and it gives them a nice professional fitting where they're safe from being knocked around or dropped. I guess you can fit a hard drive underneath but I couldn't get my seagate to fit - it is a usb portable, so there's a case that increases the height of the drive. a standard internal hdd would probably fit though. One drawback is that the mount standoffs are part of the individual mounting frames for the pi's. If all you're doing is mounting a Pi with nothing that needs extra space it'll work fine. But my Pimoroni ssd card that mounts under the Pi pushed everything out of the way. Tried different mounting configurations but really is meant to be mounted the way the manufacturer wants it to be mounted. In the end I just cut them off and used ordinary standoffs.

Great little rack for a Pi cluster with a couple of caveats: 1. Pi's with hats may not fit through the front openings -- requiring them to be installed after inserting the Pi in the rack. 2. There isn't a great way to attach larger peripherals to the Pi when racked like this -- had to fiddle with external USB disks used on two of my Pi's (also requires some post-install fiddling). Long story short, I racked this right above a network switch which helps support the USB disks etc. I love the aesthetics but it could be nicer/cleaner functionally. As a special case of #1, you'll likely have to remove your Pi from it's case, which may mean needing to find a way to attach a cooling fan.