I run the same setup. You should definitely set the new RF7s as sides. I put them to the side and a little bit behind the sweet spot. I use them for multi channel music and movies. I run them with a B&K Ref 50 and 200.5. They sound great! You really need to move them around, try toeing them in, until you find the best way to set them. I ended up toeing them all in toward the center, then moved them out so they don't point directly at the listener.
Congratulations! You will like them.