Here are some guidelines from Sonos for wall mounting the Playbar:
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When mounting below a TV, keep 1" (25mm) space (minimum) between Playbar and TV.
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When mounting above a TV, keep 2" (50mm) space (minimum) between Playbar and TV.
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Preserve audio quality: make sure the connector panel faces away from the TV.
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Keep both ends of the Playbar at least 1 ft. (30cm) from a wall or other obstruction.
https://www.sonos.com/support/en-us/sonos-user-guide/index.html#t=sonos-user-guide%2Fplaybar%2Fwallmountplaybar.htm%23XREF_29591_Wall_mounting
Thank you GuitarSuperstar. I appreciate that information, but unfortunately Sonos doesn’t address questions about space between top of Playbar and ceiling (or shelf, etc.) above, or what the user experience is when the Playbar is above TV (as opposed to typical position below) or above the plane of the head of the person watching the TV. Any thoughts you have on that would be very welcome!