Do ghosts in inactive households walk around and show up on public lots?

Okay, so with today's update, I am curious if it's possible to create ghost sims in CAS and essentially turn them from playable ghosts into free-roaming ghosts. I want to design my sims' deceased ancestors and have their graves, but I don't necessarily want them to be part of the household, nor do I want to release their spirits into the afterlife. I want them to be able to pop out of their graves from time to time, just as they would if they had died normally instead of being created as ghosts. I have already playtested that if I create a ghost, place its grave on a lot, and then split it from the household and keep it not in world, it does go back into it's grave after some time. However, my one concern is whether the ghost being in its own household means it will roam around the world and show up places like a regular townie.