Bill, welcome. The QSs have considerably wider dispersion than direct radiating speakers, and for this reason are even more suitable if they have to be positioned relatively close(nevertheless, try to separate them as widely as possible).

I'd suggest M60s with an M2 center for your use. Your offset center is unconventional, of course, but if the center image is satisfactory to you, so be it.

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Enjoy the music, not the equipment.