Distributed Bass Array configuration

I do like the fact SVS has excellent new subs with great apps 
and even programs you can use with USB Mike and online free programs and setting ,SVS 3000, and Ultra 16 are the only subs I know of with 50 + bitAnalog devices microprocessors and their Dual voice coil on these 2 models is special for when at low volume ,you use the smaller inside of the voice coil to have full control ,and when louder music is player the inner and outer voice coil is utilized .
my brother has 4-Ultra 16s in his Audio ,Home theatre setup .
the sound pressure is so immense when a low Bass note hits you can literally feel it . I have 2-3000s  , buy sealed not ported for best 
tightest Audio . , I will say SVS  tech support is the best I have encountered and I have had the top 4 brands 
and who else gives a 5 year transferrable warranty ,and free shipping ,and 45 day Audition  with even free return shipping !
no one but SVS , Even their latest mini 3000 , and $499 has an app. And I  had a JL Audio 13  before,Rel the SVS is just has much more technologies built in and theApp for phone or tablet is excellent to adjust Bass, or volume on the fly per recording if need be is great👍

Hilde45, very poor choice of experts. Mr McGowan is a businessman with poor hearing. His objective is to make money by any means possible. He is reasonable good at that. I suck at it. 
Most of these people making comments here on this subject are using 3rd if not fourth rate equipment and are running their subwoofers without a high pass filter on the main speakers, people who listen to Yello on Tekton loudspeakers.  There is no way in ---- you can get decent bass out of a system that way. The main weakness of a distributed array system is that there is no way to control time with it. You can not get the impulse from the subwoofers and your main speakers to your ear at exactly the same instant. The result is a mess. But, it really does not matteras none of these people have a way to deal with the problem anyway. They would rather spend their money on cable elevators. 

@mijostyn Both the experts cited have extensive experience in audio, i.e., it’s their profession. Neither are subwoofer salesmen. In both cases, their answers were detailed, and in both cases, they explained pretty carefully -- in Poes’ case, with great detail. In both cases, neither proffered sweeping generalizations about stereo bass, Indeed, the case was pretty well established that in many cases, mono bass was better for room acoustics and might be the only thing hearable, anyway. The information they provided is not susceptible to ad hominem remarks. To be clear, they are not offering arguments that are "pro stereo bass" or "pro mono bass."  They rebut the claim that there is NO such thing as stereo bass and it can NEVER matter. There is, and it can, with all the qualifications provided. I thought that the OP's question was seeking to learn about this topic, so I provided what seemed like good information, rather than just my experience, which is meager.

I run one pair crossed over at 150hz (in front) and one crossed over at 80hz, so I do run stereo, but I doubt it changes a huge amount in the end. I've played with the phase but don't notice any effect. Like @heelid I placed my Swarm at different heights, two lower, one ear level, and one close to ceiling. I experimented with different orientations, and firing toward the wall produced by far the smoothest results. These were very easy to integrate beautifully in my system.