I wanted to attach the DMX Artnet Node in such a way that I could remove it at any time. So this is a tray which is fitted with M3 threaded inserts from below and the device can simply be retracted from above. The tray fits so well that no further fastening is necessary.

You can also optionally insert magnets, but I didn't need them in the end.

CAD Model:

https://cad.onshape.com/documents/50d2075c50a781b64b4745bd/w/c43c75a4cf89d29257693b0d/e/19225d76e61c4b7bd8167e0e?renderMode=0&uiState=67e020b2baea2c27a86a043f