@mijostyn --
I would feel free in saying the vast majority of us do not have the room for subwoofer horns.
Maybe so. And yet; if you have the allocated space anyway it seems to me the sheer will to do it is the predominant factor, unless the horn cabinet volume itself turns out to be acoustically obstructive, something I haven't faced even when they've taken up a combined 100 cf. in moderate spacings.
They are bandwidth restricted in their upper range, certainly tapped horns like mine, so you have to know what you're dealing with in how to best suit your specific needs. I take it you're fully aware of that.
... In my case it would not work anyway. I have to form a line source with them which means 4 or more drivers in most situations. If you put the subs in corners and in a wall floor intersection you do increase their efficiency requiring about 1/4th the power to get the same volume. In this case as a line source 4 12" drivers can do a lot of damage in your typical room. My own system will shortly have 8 12" drivers in 4 sealed cylindrical balanced force enclosures.
I've wondered myself why your setup didn't comprise line source bass towers when your main speakers are configured this way, but that seems to be underway now. It should make for an interesting, dare I say significant upgrade even. Please keep us informed.