The dimensions are indicated on the CAD drawings: mx300g2-cad-drawings.pdf and mx800-cad-drawings.pdf.
ie, for the MX300 G2, see the diagram on Page 3, you can see the bracket in the upper right. It's 9" x 19.9" (229mm x 507mm)
Note: Your question would be better placed in the TelePresence section of the forums where these devices are more actively discussed than in the Other Collaboration section you've posted in - I'd suggest, if the above hasn't answered your query, that you move your discussion over there (you can do this by editing your original post).
Wayne
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Wayne
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