What are you doing for shower heads? presuming two wall mount shower heads do one 4" in the center. If you are doing a central rain head do 2 3"

What else is going in the shower, such as a rain head in the ceiling? Our shower is roughly 4 x 6 and we have a center rain head. We have 2 small sealed LED lights (appropriate for a steam shower) on each side, half way between the rain head and the wall. If you don't have a rain head, you could choose 1 or 2. Being 6' long, I'd probably choose 2. 3 seems like overkill.

PS: It's nice to put the shower lights on their own switch with a dimmer, right next to your vent switch on a timer.

No rain head. just one from wall and hand shower. i was either thinking 2 3" or 4' or one 4". I was going to put it on the same switch with the 6" ceiling light that's already in place.