Comment by ssl-3

I assure you that if randomness is the order of the day, then involving handymen to arrange things is a sure-fire method of getting there.

The cheaper the handymen come, the better the randomness is.

One doesn't even have to tell them to be random; that part happens all on its own in the ways that real apartments ebb and flow.

And the handymen themselves can be rotated out every couple of weeks, as well. The cost of rotation is low. The handymen are plentiful, and they are happy to get hired for a day here or there for literal odd jobs.

(If anyone wants even more practical solutions for robot testing facilities that don't make headlines by pissing people off, please put your contact information in the space provided by pushing the "Reply" button. Thanks!)