How does Rover handle multiple rover walkers having key access to my home?

Why doesn't Rover have a universal key-entry solution, AKA, kind of like relators use, one where I control the PIN# and can change it myself. I.E., Rover has a universal device to put on my front door, and I set the pin#, and can share that with my sitter in a private conversation etc. I have concerns about finding a Rover sitter to come into my home, have to give them a key, then a few weeks later they quit and I find another sitter, have to then give them a key, and then the same happens, on and on, before you know it, half of my town has my house key? If I had access to a universal device and can change the pin, this would alleviate the concern about multiple people having easy/key access to my home. And please don't answer saying to use a garage code or keypad entry as i don't have a keypad entry (I don't think an