Let the box breathe
No. Put it on the side. You will over heat the cable box
My cable box doesn't get very warm but it's also only 13 1/2 inches wide. I can't imagine legs for a flat-screen, no matter how small have legs close enough together to fit on that footprint
Better to mount TV on the wall.
best not to
No better to put it on the side or mount the tv on the wall
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