Why not the shower heads at the ends some water will hit the glass don't know if this is really a problem other than cleaning as long as the glass door is well sealed it should work.

Thanks Patricia. We could do one of the heads on the ends, but I want a bench so that will have to go on the other end. Thanks for your advice. I appreciate it.

My glass doors have a small gap between the stationary panel and door that would be a problem if water hit it directly.