My monitor arms of choice are the Ergotech freedom arms.

While quite a few reviews stated that you can add a second arm to the base for a dual setup, no one ever showed it.

Soooo here we go!

I've done some measurements, and there seems to be enough space on the pole for one more freedom arm actually.

Now, keep in mind that these arms aren't long enough for a traditional side by side monitor setup, but there's nothing stopping me from putting a monitor over the ultrawide.

That is, as long as the arm can reach that high.