Your speakers are set up for 5.1, placement can vary depending on the situation. Where in the ceiling are the side-surrounds in relation to the seating area; directly to the side or to the side and slightly behind? For the rear-surrounds you could go with either the R-5650-W or R-5650-S, which is a bi-polar surround. What are your room dimensions? Are in-wall/ceiling a requirement? In-room fronts & on-wall surrounds are preferred. Is the drywall up, can changes be made for wiring locations? If you don't have it already, download the Denon manual, starting on pg. 88 for speaker location info.