34" ultrawide + two extra smaller screens for productivity - any experiences?

Hi guys.

Currently I've got an Acer x34. It's lovely.

However I'm wondering whether to permanently add two extra monitors to the side of it.

I got an old 24 inch, but that was waaaay to high. I didn't use it then.

I've looked at 15-16 inches so it'd fit the height of the screens but I can't find any used in Denmark.

I also can't decide whether it's worth it with an USB screen around 15 inches.

Can anyone share their thoughts, experiences and maybe pictures?