Playbar height in laid down configuration when wall mounting not possible

Userlevel 2
Has anyone ever placed a Playbar in a niche over a fireplace and had to use it in the lay down configuration (like on a cabinet) with the Playbar 5' above finished floor? I have no space to mount Playbar facing outward. Was wondering how it might sound. I thought maybe some sound would reflect off the tilted TV screen.

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