Question about Flexson Wall mount for Sonos One and Play:1

I would say no. If the bracket is screwed to the ceiling - which is of course possible - the loudspeaker is "lying", i.e. the mounting surface and the loudspeaker are parallel. The bracket can be tilted a little, but not 90°. On the other hand, the Sonos speakers are designed not to be optimally placed - so you can do that. But the question is: why not just mount it on the wall instead of the ceiling? If it has to be somewhere in the middle of a ceiling: that looks very strange, there are better alternatives.

@Info: Have you now mounted your Sonos boxes on the ceiling? I have the same problem as you and am still looking for a suitable place. Greetings and good luck!