I'm not Danny, but just wanted to provide a perspective for you --- three feet is a guideline only. My first OB dual servo sub was against the right wall next to a sofa. Nevertheless, it still sounded much better than any box sub I heard. Since you'll never have ideal conditions, buy the best gear you can and work with it.
Another thought -- for critical listening, you can always pull the subs out into the room and push them back when you're done.
Thank you. I wasn't very clear but I was asking more with the "Otica" on my mind. I owned a pair of Magnepan 3.7i that were in the same spot an Otica could go, without wall treatment. I thought they worked fine, but I also don't lock my head in a laser configured jig when I listen. I am much more of a "Content and Tone guy" than 3D / hologram guy. Make the speakers disappear and give me the right tonality... then onto the music. Good to know about the OB subs - perhaps not ideal, but better than a poke in the eye.
For me, subs are like ketchup and mustard on my hot dog... I only like a little bit, but I'll miss it if it's not in there. That's how I have my current subs adjusted. Up enough to where I think I start to hear them, then back a click or two. In fact, when I engage or disengage them, there is very little difference - but that speaks more to the low end of the Wilson Duette, I think.
So far, I think I've got a list of 4 or 5 different pairs / system setups of GR speakers I'd like to run thru here - and a rash.