Hello benzman,
Congratulations, Prepare to be amazed!
Imho, the beauty of the distributed bass array (DBA) concept and system is that it provides near state of the art bass performance in virtually any room and with any pair of main speakers. My advice is just to take your time and strictly follow the sequential procedure for optimally positioning each of the four subs in your room. Any furniture/décor adjustments and cabling concealment can be concentrated on afterwards.
When I purchased my AK Debra DBA and knew all four subs would be operating in mono, I was a bit concerned about how this would effect my already very good soundstage imaging. I was very pleased and relieved to discover that the addition of high quality deep bass, even though it was in mono, not only significantly expanded the size of my system's soundstage image it also greatly improved the perceived level of detail and realism within the soundstage, including a greater sense of the acoustics of the recording venue.
Enjoy,
Tim