Poutinehifi said most of what I was going to say so I will only add that I recommend some kind of articulating mounts. That way if you decided say, 110deg, you can aim them up/down/behind/ and in front of the LP. IME taking the time to properly aim them can do just as much for cohesion as setting width and toe for the front speakers. I, like j_garcia prefer monopoles and I find they lend themselves to modern soundtracks much better since there is so much soundtrack information that is directional. Di/bipoles just can't image the same way. And don't let anyone tell you just to plop them wherever, since there's not much information in the surround channels. Fwiw, my surrounds tweeters are at 77 inches high and about 2' behind the LP. This gives me(in my room) a great mix of overhead sounds, ambiance, directionality, sounds behind the LP, and cohesion with the fronts. Lots of trial and error. I think you'll find putting the time in will be worth it.
Good luck.
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