"Thus, my preference, IF subs, use a front facing stereo matched pair, located adjacent to your primary speakers. "
I would stay away from this type of installation, unless your value aesthetics over getting the best sound quality.
We position our main speakers to provide the best best overall sound, but their ultimate position does not guarantee that the woofers are in the optimum position for low end accuracy. Adding a pair of subwoofers will only address room deficiencies if they are placed with that in mind.
Keep in mind that whatever problems with the woofer positioning, will only be exacerbated by adding more low frequency energy to that same location.