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I used to have a Sherwood receiver that switched itself off when I put my dvd player on top of it. No problems when the player was removed. They really need that free space above them so would advise you to put nothing on top. Hope this helps.
Receivers get hot and need air space for cooling. Blocking the airflow with a DVD or Bluray player will lead to overheating with various problems (including destruction) and should therefore be avoided.