How to attach your VESC trampa 75/300

I have to fix my VESC trampa in my waterproof aluminum box, but it is only 2 mm thick, I was thinking of drilling and tapping but the waterproofing would be compromised, any ideas?

Clamp it down. If there are no thread holes inside the box, you could hold it in place with 3d printed spacers between the vesc and the lid. A picture of your box could help.

This case has 3 M4 threaded holes on each side on the inside at the bottom.

we press it against the wall with some wooden spacers. don’t forget to put a thermal pad or thermal paste between the VESC heat sink and the wall of the box.