Receivers Is It Okay To Stack Dvd Players And Various Tv Receivers And Consoles On Top Of Each Other?

Is it okay to stack dvd players and various tv receivers and consoles on top of each other? - receivers

There are problems due to overheating or short circuit. I know most of the recipients have an opening at the top and can be blocked or restricted. I stack a DVD player in the top of my DirecTV HD receiver.