The right height would be different depending on who's using the shower...a child would likely like it lower than a basketball player. That's where the bar is handy, you can adjust to the individual's desires. You don't want the base too high so someone can't remove it to use as a handheld. this may be impossible if the shower is going to be used by both children and adults. Then, there are petite adults and skyscrapers...what I'm saying is it is preference. With those handhelds, the actual shower is higher than the base bracket holding it in place, so you need to ensure you have enough overall total height available in the room, too. It can stick up 6-8" or so from the swivel. I prefer not to have to duck to get my head under the shower. So take reach and user height into account, and put it where you want. Somebody else will maybe give you a 'standard', but like in clothing, one size doesn't fit all (or at least very well!). Put it where you want - it's your house.