I'm just using this thru grommet mount.

I have 2 34” ultrawides stacked. The arms on mine are pretty close to full extension. I like to keep the desk closer to the wall. I ended up cutting a little off the top bar, it’s two pieces. I didn’t like how it looked with the bar higher than the monitors. This is the one I use.

VIVO Extra Tall Vertically... https://www.amazon.com/dp/B083G8GDGD?ref=ppx_pop_mob_ap_share