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I use the ergotech freedom arm. It's pretty pricey compared to others, but it offers some of the best articulation in the market.
I completely agree the PG348Q stand is atrocious lol. I went with the freedom arm off of amazon. It can easily move to where-ever you need it with ease.
Hey man. It's an Ergotech Freedom Arm which is holding up this heavy screen just fine. Totally check it out!
The Freedom Arm by Ergotech is one I've seen mentioned a few times, apparently has a full extension of 26.7" - Link
I use a Ergotech Freedom Arm with my 34UM95. Same size profile and weight as your U3415W.
Works very well. Sturdy, clamps to the desk, and has great field of movement.
I can recommend this Ergotech arm, cheaper than the Amazon one and really reliable.
Ergotech Freedom Arm
They are the Ergotech Freedom series in metal gray. I bought them on Amazon: [link]
Ergotech is a great brand for mounts, their desk mounts are either too heavy duty or not heavy duty enough due to this monitor being right between their recommended weight min/max as I have heard from the reviews.
But here are the links; this is for the 8lb-18lb monitors, and this is for the 20lb-30lb monitors. The X34 weighs between 13lb to 16lb (without that metal stand attached). I haven't been able to confirm the weight because I seen Acer state both weights. So if you wanna go safe, get the mount for the 20lb-30lb range.
Personally, I bought the minimum weight mount because it's black and a little cheaper. As well as black is the completely unintentional theme color for my whole rig!
Edit: Forgot to specify the weight of the monitor by itself
I can tell you that the Ergotech Fredom Arm holds up to 17.8 lbs (8.07kg) and works well with my LG 34UM68-P 34-Inch weighted at 17.6 lbs (7.98kg). My assumptions is that as long as the vesa mounts on both your desired arm and monitor match up and the upper and lower weights are within spec you should be fine.
Ergotech Freedom Arm - Metal Gray (FDM-PC-G01) [link]
For the monitor and a wall mount for the tv. Let me know if you want to know that too.
It's the Ergotech Freedom Arm - I forgot to add it to my parts list.
I have this on my x34 works perfect. Sorry half asleep didn't realize you wanted dual arm... I think they make this in a dual too
The monitor arm? its called the Ergotech Freedom Arm