Lego Compatible 2-gang Switch Plate.  The fire protection police are definitely coming for this one, so please print at your own risk.  Recommend a high temp filament and to only install if you have some confidence in your buildings electrical.  Using a rated switch plate cover is safer than any 3d printed option.

Studs are slightly larger than lego spec to make things tighter since (I assume) you wanted to use this vertically.  This may make it harder for large plates to stick but should help with smaller ones (minifigs).

Inspiration stolen shamelessly from @HoldenArtWilli_10350 this is not marked as a remix since I created an independent model.