POrange

Hi- I'm really new to home theatre/surround, and I realize how remedial this question will be to so many of you. Thank you for helping a new guy out. I've gotten a Klipsch system. I have towers and a center speaker in the front. I have an RP-500 SA on each of the towers. In the back of the room I have two RP-500M II speakers. I have two additional RP-500 SA which I thought would sit on top of the rear speakers similar to the towers. Looks like that's not right. Can someone please tell me how I should be using the rear 2 RP-500SA II speakers? Thank you very much for your help!