i used to have my 7.1 rti6's sitting right behind my center recliner. it sounded superb (imho) if you sat in the "sweet spot". but if one were to sit on either opposing recliner, they'd hear the rear-surround effects off-axis, meaning they'd hear sounds from only thier left or right side of their heads instead of evenly behind them.
now i have them set back quite aways so that whilst sitting in any of the three rear recliners, they all become a "sweet spot" with even surround effects. all i had to do was get off my lazy duff and cut the speaker shelfs at work on our handy-dandy lazer and weld it up and mount the rti6's atop them. and i had to "CRAWL" around in the attic as i decided to run the wires up through the roof and through the attic vs. having exposed wire run along the floor or ceiling. it's so much of a cleaner look. good thing i had help to fish the wire through the holes and not to mention, make sure i did not die from heat exhaustion and inhalation of blown-in fiberglass. must've been like 135 degrees at night up there. phwew!