I could draw up a diagram, but it's absurdly simple. Just take a "T" off your hot and cold supply tubing for the second valve. In my case, I ran the rain head tubing from the supply valve up the shower wall, and up in the shower ceiling (attic floor) joist bay. There is a finished attic space above, though this part of the attic floor is behind a kneewall. For that horizontal run through the attic joist bay, the pipe is pitched for drainage, so when the rainhead valve is turned off the horizontal pipe does hot hold water. The bay is also insulated above the pipe. You could have exposed tubing within the shower if you wanted. If you want to have a traditional shower arm, you can do it. But these heads can be rather unwieldy at the end of a horizontal shower arm that extends out of the wall. You could always fashion a bracket to secure it to the shower ceiling too, that would prevent drooping. The reason I usually install rain heads from the ceiling is that I like them to be in the middle of the shower, not near a wall. You are correct that a true rainhead, you want it horizontal, not at an angle. Do understand there are no hard and fast rules as to how it's plumbed. I simply have my preferences. If you want the rainhead close to the wall, no worries! If you want to keep the plumbing out of the ceiling but still get the head towards the middle of your shower, I did a search for "rain shower head ceiling bracket" and got these three hits, they might give you an idea on how to make up your own solution:

Thanks Patricia. I do have both - I have the slider bar with the adjustable hand held thing and then the Rain CAn thing. I NEVER shower - always bathe - and this is for my husband not really me so I want him to enjoy it - do you think using the rain shower is ok and then if you need more force or a massage, etc. you can use the handheld thing? would you recommend it this way? I cannot see my husband taking the time to remove the adjustable thing and use it. So I am relying on the shower head for him getting clean, etc. WIll the rain shower do a good job of getting him clean in a jiffy?

You are right, that is the best solution-if you are going to mostly store the shower curtain inside the tub. I'm only going to be using this for an occasional shower at, if at all so the shower curtain will usually be hanging on the outside of the tub. Even I even keep it hanging; I may just have the contractor install the rod and skip the curtain for now. Can anyone who showers with a rain shower help me??? Does the water splash less towards the back wall???

Agree with what Mizlizzie wrote. I try to keep the bottom of the rainhead a minimum of 7' above the tiled floor. You can mix drop arms. Most are universal 1/2" thread. Generic finishes like Chrome are pretty much universal, you can mix and match from most any manufacturer. If you have a designer-type finish then sure, it makes sense to stay with within one manufacturer's product line.