The MX I bought was recently delivered by UPS and I have to say I'm happy I didn't choose to mount my addition screens on them, don't get me wrong the mount is perfect, but the height adjustment is completely dependent on the weight of the monitor. The heavier the monitor the lower it will sit. If you're mounting additional monitors around your 34UM94 I would suggest either getting LX mounts that have a height adjustable pole, or the massdrop freedom arm. That way weight differences won't be a factor in aligning your screens.
This might be a niche problem, but for those using multiscreens with this mount it will come into play.
This might be a niche problem, but for those using multiscreens with this mount it will come into play.