When I visited an escort in Belfast before Xmas, there was a police car parked across in another street directly facing the premises, around the time of my booking.
I just walked on and to the vicinity of a nearby shop, and called the escort to let her know Waited about 5 minutes and the car drove by the shop, moving on to some actual proper work maybe. But managed to get back and visit the escort.
Would be wary of visiting the location again though. Seems to much of a coincidence, and possibly the police are aware of the premises being used by escorts.
I know of one block of apartrments on the near north side of Belfast city centre that were used by a few escorts was effectively shut down.