component placement

Now looking for advice. My dilemma is that I've run outta space for an area to place my cd player. While normally it would be fine to just buy a shelf and place it on I cannot really take anymore area from around my tube gear for the fear of it overheating. Is it dumb to put the amp on top of the CD? Would the heavyfeet that I use drain vibration from both component's properlly? (I could insantly hear better sound when I had the cd player on a shelf of it's own w/footers) Any other solution or idea is more than welcome. While it would prolly look best on a wall shelf directly above my rack I'm trying other ways.