Amp stands will improve the sound of most tube amps (I haven't experimented with SS) even top of the line amps. I personally use long speaker cables (Dunlavy to match my speakers). I have my monoblocks side by side with amp stands on top of oak platforms isolated from the floor with inner tubes. There have been several good threads about isolation as well as amp stands.
Stacking power amps mono blocks
I have two tube mono blocks that are stackable. However when I put one on the other there is only 1/2" space for heat dissiation between the two of them. I am worried that the lower unit will fry over time if it gets to warm and the heat from the tubes can't escape. I can obviously put a 2" x 4" to create space. However, the look may not be great. Anyone that has figured out a nifty thing or purchased something that creates a nice 3 to 4 " gap between two pretty heavy (at least 50 lbs each) power amps. By the way if I put them into my Target stand (the ampsare 8 " tall (mono blocks) I need to remove one shelf and loose three shelves and not great look for putting in two amps. I am I just not getting it?