Firing the length is great-IF it were a dedicated space, and you could push the speakers out 6 feet and your seat is somewhere just off the middle of the room.
Reality, you're using a living space. Keep the sub for service. It will still handle the under 40Khz bass which in real world conditions, is a floorstander starts to fall off.
Some will chime in with suggestions for wall friendly brands, though nothing replaces allowing the speaker to "breath" with plenty of space behind them.