In practice it worked perfectly well for me for more than two years living in shared flats in different places in Germany to give out only c/o (bei) addresses to anyone I ordered or corresponded with, I'm not aware of anything that got lost despite not having my name on the doorbell and post box.
You could even invent a name put that on the door and still c/o yourself, I guess that still would work. The only people who annually enter rental flats are normally the "Heizungsableser" people (heating consumption read out) and even they go floor by floor and not by name first.
You could even invent a name put that on the door and still c/o yourself, I guess that still would work. The only people who annually enter rental flats are normally the "Heizungsableser" people (heating consumption read out) and even they go floor by floor and not by name first.