[adzii_nufc]

Shrouds and enclosed shrouds like that are the common practice on new build homes. Generally the developers and construction workers plan and install the optical cable through the walls with the electrics so that they come out via a wall socket somewhere in the property and these cases used to cover what was essentially a hole in the wall behind it.

I generally find it good practice to at least use some form of ONT shroud rather than have two screws and the ONT slotting onto them.