Mazer's suggestion is how mine is right now. Reason? More ideal for the sweet spot, being the front row, where I sit probably 80-90% of the time. However, its too far forward of the rear row. They are toed in some for the front row, and having it less "direct" to the rear row actually helps ameliorate the negative effect of forward-sounding surrounds a bit, if only by being a bit quieter...
I would like to try some bipolars someday soon for greater coverage. A tip I picked up in the How To Calibrate A Multirow Theater audioholics article.
So.... that's a tough cookie... but my present idea is to actually install two sets of side surrounds. One for each row. Ok, in your sig I see a receiver + amp (how many channels?). To get dual rows of side surrounds, you'll have to use both receivers surround amp channels AND the side surround pre-outs to the Emotiva. Then level match.
You can just install speakers for now, and amplify later... but just in case its easy to do this all now at the same time... its an idea.
Whaddya think?
If you end up hating it, you can always just forget the rear row for instance, disconnect them, remove em, sell em, return em, something. I bet you might like it though! Something I think about time to time... though never have tried it.
How many ft is it from front to back row (same point to same point)? How wide is it from left-most viewers head to right-most viewer's head?
cheers.