An Odd Question

BTW, every object in your listening room is subject to sympathetic resonance.

Yes but the body of a guitar is made specifically to resonate and amplify.

mysterioso1 OP
Just plug up the sound hole in them with a sock or tape,  and damp all the strings with a clamp.

Cheers George

Sonic impact of having multiple (3) acoustic guitars on stands in your listening room?

To kill off most sympathetic resonances
Put a soft clamp across all the strings, and block off the sound hole in the bodies.

Cheers George