Comment by raverbashing

"Except that your name is also put on your doorbell with a label-maker"

Never seen this in Germany. Not that I remember, but most places, no, this doesn't happen.

"downstairs/apartment building's set of doorbells also proclaims last names, and are often ordered by floor"

They thought of that. So they mix it up, or just list, it has nothing to do with floors

"In fact, it's advised that you don't put any first initials/first names on your doorbell"

Correct, they usually put last names only.