Hello, my system consists of Polk Audio center, Infinity towers and 3 Polk Audio in ceiling speakers for the rears. I know it's not ideal but it had to be done to please the Mrs. My question is, is it worth buying a new receiver for Atmos capabilities and will it sound right if I add the in ceiling speaker for Atmos when I already have my rears in the ceiling? My ceilings are 12ft by the way. Thanks for any advice.