Comment by nl

I got the TecMojo 10" 6U rack[1] from Amazon for less than $100. It's great, and even came with 2 HTML USB adapter boards (I think for some variety of R-PIs?)

Getting something with actual, standard rack-mounting points is worth it because you can use the huge variety of 3D printed hardware to match it very easily.

I agree with the other commentators that power bricks are a problem though. My setup is fanless and silent which is an extra challenge.

[1] https://tecmojo.com/collections/mini-server-rack