Much of the "work" I did leading to LCS (I use this term euphemistically, as this is more of a passion) was experimenting with six identical Dynaudio Esotec monitors. I built six monitors, 2 required per each LCR channel for Trinaural Processor based system. The monitors are much improved clones of some of the best stand mounts I ever heard, the wonderful French ASA Pro Monitors I purchased on John Marks' recommendation. The clones are rear-ported classic mid-size, HWD about 14.5x10.25x11.75.
It was work, but it was also fun experimenting over time with different physical orientations between two matched monitors. Every iteration started with one stand-mounted monitor set up in classic fashion, firing forward, with various toe-in angles. The "Effects Speaker" eventually made it's rounds to every imaginable location, firing in every direction, with polarity same and inverted vs. the Mains.
Duke optimized the Effects radiation for best performance, exceeding that of any regular monitor w/ one tweeter and one mid bass. Even flush against the front wall Zephrin 46 will outperform a mono pole, dipole, or bipole placed in like manner. At the earliest convenience, after Zephrin 46 arrives in my sound room, I will set it up in such fashion and report on the results. At Newport I presume we'll site Zephrin 46 spaced a few feet from the front wall. I'll consider the performance difference, and won't necessarily cross off the idea of short front wall spacing, though Tony Chipelo has last say on everything in Newport.
Ideal spacing, a few feet, provides the best overall listening "stereo" experience ever, by huge margin. I presume, but could be wrong, that flush front wall reduces depth. But who knows, maybe depth is similar or equal.
Based on experience with Dream Maker LCS, I believe even with Zephrin 46 flush against the front wall, front wall acoustic treatment is unnecessary. I will listen with it flush and spaced and report results.
I spent many years listening in a LEDE room, both my own and another room owned by a full time professional speaker designer. After this journey, I am much less a fan of LEDE. I did notice in VMPS' LEDE, with his best and largest towers, and especially systems with separate huge floor to ceiling subs, pretty good spatial effects at times. But not even in the same ball park compared to the overall spatial excellence of LCS with a much smaller speaker.
A moderately live room seems ideal, with select treatments placed at the usual suspect locations. This room has wall to wall carpet. Several years ago I covered the rear 60% of the carpet with plastic and paper tarp, which very much seemed to improve every performance aspect. I moved the tarp forward and backward in 6" intervals, and was amazed at how audible were such changes. Based on that, if I was building from scratch, I'd place heavy pad and carpet over the front 40%, and hard reflective surface on the rear 60%.