I've never really understood the need for multiple hides. If I use any, I use 1, and I put it on the warm end. If your snake would rather hide on the cooler end it will move the hide. I've seen it done many times!
I have one hide for smaller balls in the middle of tub water on cool end. Big snakes no hide no provlems. In 28 qt tubs. If I had bigger tubs I might have two but some of my snakes sit on top of hides any way. All mine eat great also if you put paper in tubs they will hide under it if they want to.