Well since you have atmos downstairs maybe try with just the fronts and then just with the rears and see which you like better. i realize the positioning wont be ideal but it should give you some idea of what to expect. I havent added ATMOS yet still waiting on Emotiva for the upgrade but i will start with just 2 channels as well to ease the financial strain initially. So when you figure this out let us know your impressions, my money is on the fronts since the surrounds are quite close in a 5.1 anyway.
