I have 4 subs.
2xYamaha HS10W - Front Wall ~3' from left and right wall on floor
2x Yamaha SW181v3 about 8' from the front wall, up against left and right wall on the floor. Run off of a Behringer Inuke 3000DSP
I was using a miniDSP-2x4 balanced to handle delays and crossovers... But...