This is the unfortunate situation in many places..
I would invest in beer and burgers, and invite them to the grill often. Would probably give you the best bang for your buck.
The stands could be contributing a small amount, but I wouldn't think it will solve your problem. If it is your floor that its transmitting to, it would be difficult to contain without construction. Perhaps you could move to a different room in your place? Or perhaps now would be the time to invest in good studio headphones...
Neighbors, gotta love em!