All good ideas, here's some additional spit balling.
If such a map was made, players playing as props might be disadvantaged, for instance, if youre in say an apartment map and the props avatars available are a chair and a lamp, everything else can be ignored while searching out players.
Probably should make a lot of different prop avatars, or make the world say, a chair and lamp warehouse, where 90% of everything is a chair or a lamp.
Also perhaps scatter prop avatar pedestals throughout the map so players could swap on the fly to re-hide. Or even make "tiers" of prop avatars where common ones are easy to get to, and better ones have a higher risk to get to, maybe even the best ones being just short of hidden?