We only use 1 hide per enclosure in our melamine cage systems. Our snakes seem fine that way and have no signs of stress.
Personally I think it has more to do with the type of and conditions in your enclosure. Tubs don't really require hides and don't really have a wide thermal gradient. Our melamine cages are precisely controlled with thermostats and radient heat panels. Now if you had a glass enclosure that had a 10 deg or so difference between the hot and cold side, you would want hides on both ends.
Ultimately however you need to look at the snake. If it is eating well and not stressed then it is OK with its environment.