This mount is intended to be compatible with the 19-inch modular rack mount system Mauker designed. You can check out their collection to find other 19-inch mount modules.

This was specifically designed to pair with my mount for a Dell Wyse 5070, to provide a place to put the power supply, and/or external storage.

I suggest M5x20mm screws, or slightly shorter.

The current version has a lip on the back to stop things from sliding out, but it will either need supports or amazing bridging settings to print nicely.