Definitely don't put them at the top of the wall. Most people go a little above ear level which is the traditional 7 channel surround recommendations, but the new Atmos specs say to put them at the same height as the mains, and no higher than halfway up your wall. It seems that most people are still elevating them a little though.
Thank you. I just wondering because even at the store when they have klipsch demo they have the surround speak up on the top of the wall