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My understanding was that the Echo Dot uses beamforming on the plane of the ring to determine where you're speaking from for ambient noise reduction. This usually works well when the Dot is on a horizontal surface because rooms tend to be wider than they are tall, so noise sources are spread out horizontally. Because your thing mounts the Dot vertically on a wall, I'd guess that this makes it harder for Alexa to understand you in noisy environments.
Have you compared how easily Alexa understands you between having the Dot on a flat surface and having it mounted vertically?