Be prepared that unless you're putting your ultrawide (that's the bottom monitor, right?) Really close to the desk, you're not going to be able to see the bottom of your 27" monitor on top if it's behind the ultrawide.

I'm having the same issue now with my ErGear. This one.

I'm still looking for a pole that I can swap out so I can raise my monitors. The Vivo 39" is the PERFECT pole height for this, but I'm hesitating as I have no idea if it'll fit the ErGear arms. Will let you know if I decide to risk it all lol