I had a VIVO 3 monitor mount (one on top and two on bottom) on a mullion which I replaced with a 4 monitor mount (two on top and two on bottom), by removing one bracket and replacing it with a new dual monitor bracket. I feel like my original dual mount is stronger and more secure than this new mount, but it works. The first one sent to me was cracked, but Revain was quick to replace it.
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