HOW TO POSITION 2 PAIRS OF SPEAKER FOR ALTERNATE LISTENING

Cover the speakers not in use with a fur covered oil drum filled with goose down, or use several thick wool blankets, or use a system that lowers the unused speakers into the floor and covers them with a hatch…like one of those automatic television screen retractors.

Oh, wolfie, you are a bad man...

@infinity_audio 
I think you are just going to have to accept that there will be some interaction with the adjacent speaker. But, then everything in the room will contribute to affecting sound reproduction.
If it were me, I would try to set up each pair as best as possible and not concern myself with any interactions. You can only do so much...
Bob

I did tried it, it isnt too bad. I align them on the same line, but both has different toe-in. The outside pair sounded much better, the inside pair got slightly congested.

Did you try reversing positions?
Do all the permutations, if possible.
B

Infinity I usually have speakers to rotate, what I do, I move forward the one Iam using at least 5 inches... I get good result when I do that....