My advice would be pick a chain hotel (premier inn etc) book in with a small bag that you can carry back out when you leave within a couple of hours and it doesn't look like you're checking out. (Backpack)
Leave the Room key in the room when you leave.
I've done it loads of times and have never slept at the hotel. Used for escorts, swing meets the lot.
Never had an issue. They don't care as long as your not upsetting other guests.