I was initially a little skeptical about how the perimeter brackets would look, but they attach well to the edge of the grate and look better than I expected. As others have noted, the majority of the mount is plastic along with the adjustment rail. I guess once it's in place I won't be messing with it. They force you to mount the speaker upside down if it's above eye level. I balked at first, thinking it would look weird, but the SONOS label reads the same thing upside down and gives you access to touch controls, which is a pleasant surprise.
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