T, the idea of mounting it above but also behind the TV should be avoided if possible. The speaker being recessed somewhat to the rear would have its output somewhat reflected/diffracted by the body of the TV. The placement below and tilted back(maybe just flipped upside-down)to point at your ears should be good. Again, don't recess the speaker; have it at least even with the front edge of the stand.

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Enjoy the music, not the equipment.