I was thinking in terms of firearms optics, where you want your “zero” (where you’ve dialed in an optic so that point of aim is (nearly) equal to point of impact at a given distance) to be repeatable if you make adjustments to the optic and/or have to remove/reinstall it for some reason.
That’s kind of what I was thinking with my prior comment.
So are a lot of us who have commented in the Wishlist topic for such a thing:
That would be one of my concerns, as well, which is why it’d be nice to have something that’s actually designed to work from behind the door.