Amp have enough air space?

And if they are running warm. how about fans? Saw acinfiniti fans, looked interesting.

Watch that it does not get too hot. If it does not the best scenario for longevity and sound may or may not be affected. 

Parasound also recommends not installing in a bath tub, or on top of a ladder, and probably warns of twenty different ways the amp can die, or kill you, or both. Or so I assume, having seen the number of pages manufacturers waste on such things expand over the years to the point we are running out of forests to print all their silly warnings on. Fortunately the inter web and word search to the rescue, you can find actual information buried in those manuals you just have to know how to search for it.

Never fear, the amp will go into thermal shutdown if it gets hot enough. Which if you are crazy enough you can do regardless of how much space you have around it. Are you that crazy? Then no worries.