Front end is easy - centre under/above the TV, front left and right speakers to either side of the set. Where is/are the viewing position(s), and what are the speakers you'll be using on the rear channels?
The speakers are Mission FS2 NXT Flat speakers, front and rear. The TV is in the corner and the viewing position is along the long wall opposite.................. Hope that helps as i need help!!!!!!
Then rears either end of the wall behind the sofa, mounted a bit above ear level.
Due to the dispersion characteristics of NXT panels, positioning isn't so critical, so they're a very good choice for this less than ideal - but of course very typical - layout.