I have a 4.0 Axiom HT setup with M60 and QS8. I previously had them installed in an apartment with concrete between floors which I won't have in a new apartment I'm moving in soon, so I'm worried about the sound leakage. Would FMS QS stands provide better sound insulation? A lot better, or by a small margin only (given they cost ~300$)?

What about sound quality on wall vs on a stand?

Also, the apartment will be on the ground floor, would that allow me to get a sub-woofer without disturbing too much neighbors?