Sorry @high-amp I got carried away. I thought they were up for active discussion.
Room treatment purchased is expensive. Room treatment made is inexpensive and can be exactly the aesthetic your wish.
Sonos has many happy customers :-)
By the standards of this website, swarms are not expensive, but I don't know your budget.
But let's go back to those Spires. Floor to ceiling arrays, ESL, ribbon, etc. (or close to floor to ceiling) are more immune to floor and ceiling bounce. Why not look into those again. You do fix the response with DSP. Don't look at DSP as complicated, look at it as an extension to your hobby. Something to have fun with.