We are a family of 10. We just get 2 rooms, adjoining if available but if not I sleep in one room with the baby and 3 others and dh sleeps in the other with the other 4. If his is the case we always get side by side rooms.
We prefer the Mariott hotels as dh get tons of free nights because that is where he stays in when he travels for work which is weekly. He is in the rewards program. He averages only 2 days a week home most weeks.