My view of case for RD6006 with an angle (25 degrees). Backside as hexagons for airflow and modular base for adding connectors for power.

To ensure that the case is secured with the device, there is there is a hole for screw and nut. These are designed for M2.5 nut and screw. You can use M3 if you want, but that might require widening the whole on the device itself. However, the device should stay in the case just fine without it. 

Depending on your use case, you might have different needs for powering the device. I wanted to have USB-C on the back side. My mount for the USB-C PD Decoy can be found in the files. It's designed to be quite tight to avoid clue. Hexagon hole is 15mm from side to side (see the pic. Note: the hexagon grid in the pic is not aligned symmetricly, but it's fixed in the design). 

Can be printed with Prusa Mini.