I noramlly put Slave Suite, my Office, Training, and everything else related to slaves to south and everything related to customers to the north (arena bars and Hotels etc) Keep only couple long 2 square walkways to join everything.To keep the scrubs out of the Master Suite, I do what I always do. Tourists won't walk through military rooms, so using a couple of armoury as the only route into my Suite (and lab)
Plus, having a couple of those smallest ships (drones?) makes it look like my suite is defended.
Really though, we just need doors that non-staff can't open.