I’d suggest starting from a bolder position. Your opening offer could be ceiling mounted speakers. When that gets rejected you can propose floor-standers. Eventually you’ll compromise on stands for your current ones.
There's a danger that the opening bid will be accepted due to the minimal affect on visual amenity, which seem to be the most important thing to the opposition, and then tbc is stuck with sorting that out.
I’d suggest starting from a bolder position. Your opening offer could be ceiling mounted speakers. When that gets rejected you can propose floor-standers. Eventually you’ll compromise on stands for your current ones.