Cast in brass, this is a pressure balance "rough". While you will never see this once the wall is tiled, the quality and engineering of the rough is the most important part of your shower system.
I am asked all the time the best way to lay out a shower. There is really no “best” way. The design and layout are a function of personal preferences, budget, wall and door placement in the shower and valve selection. There are two things that are a must in my opinion: a hand shower and a place for soap and shampoo.