I have searched the threads and have seen some information dancing around what is needed for installing two shower heads but here is what I haven't gotten a good answer on. I know I will need 3/4 supply lines but I want to be able to simply split the supply lines in the bathroom to the two shower heads. Is it better to independently control the heads since they won't be used at the same time all the time or do you control the temp in one spot and have a shut off valve for each head...I think I'm starting to confuse myself. What is the minimum I would need to get the job done? Thanks in advance for any help