I'm afraid a 34" is a bit heavy on the arm and I'm not sure the arm spacing will allow it. I'm afraid a 34" is a bit heavy on the arm and I'm not sure the arm spacing will allow it. I put two 27" side by side and it's perfectly fine

I confirmed that I tried the 34" next to a 27" and the arm of the 34" does not natively support the weight of the screen. I had to block the arm so that it would not move.