VIVO monitor mounts from Amazon. This vertical one for the two in the middle: https://smile.amazon.com/gp/product/B00DGTP57A/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

And two of these for the side monitors: https://smile.amazon.com/gp/product/B00B21TLQU/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

They make a quad-arm stand for four monitors in my exact setup, DO NOT get it. I tried it - for as well as these work, that one was equally terrible. It doesn't balance correctly and would not stand upright, the whole thing was about to come crashing down. But I've been using these VIVO stands for years and they've worked really well for me.

Yea it can hold it tilted up if I needed it to. I have a piece of steel under my desk where the arm clamps to the desk for added support. I used to run a tripple monitor setup with a 34” and 2 27” soo i absolutely needed the steel to reinforce the desk due to the weight. I am using this mount