I can't say I am a proponent for it as I have no true experience, but I have seen a lot of discussion for Double Bass Array (DBA) placement for Subs. In general, the discussion is very positive for those who can do it properly. With all things, this includes proper engineering of the whole system and not just throwing a collection of second hand subs together.
All should match and there is a formula for how they are placed on the Front and Back Walls. If correct, this arrangement should be very effective at eliminating room modes and phase issues.
Again, I'm not an expert here, just putting the theory out there as I've seen it. I certainly don't have the right room to try it out, either.
Just for sake of simple introduction: