Need advice on whether to omnipolar with nanosat or directional with orb mod1. Room is 20'L x 16'W, TV is in middle of 16' wall. Sectional is 12 feet from TV in middle with L portion running along the right wall. Surround positions are 7 1/2 feet up on wall to either side and rear surrounds are 9' behind couch. Part of couch is in sweet spot but the corner and L are right under right surround. Looking to upgrade surrounds, size matters (have JBL northridge already) but not sure which would give a better movie experience in on couches. Any advice?