I’ve started the process of raising my cabs using Amazon risers, there are hundreds listed, you can shop around and find them for $25.

https://www.amazon.com/gp/product/B07RMX6MBR/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

I had some left over U channeling to even out my cuts since I’ve never cut foam or used a hot knife.

https://www.amazon.com/gp/product/B07DCDV757/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

Foam board enough for 3 cabs – front and 2 sides

https://www.walmart.com/grocery/ip/Elmer-s-Sturdy-Foam-Board-Sheet-Black-20-x-30-x-3-16/17011432?wmlspartner=wlpa&selectedSellerId=0&wl13=355&adid=22222222420&wmlspartner=wmtlabs&wl0=&wl1=g&wl2=c&wl3=496703829587&wl4=pla-293946777986&wl5=9013038&wl6=&wl7=&wl8=&wl9=pla&wl10=120643079&wl11=local&wl12=17011432&wl13=355&veh=sem_LIA&gclid=CjwKCAjw07qDBhBxEiwA6pPbHj2wdO3ADdV_EUxtaD0oA1FMrl6PjLEr1IPIfjaFS1NLuPwmF3d_ChoC9XsQAvD_BwE&gclsrc=aw.ds

The results are great so far, I can see the entire screen, never having to lean back. I have some cabs that have horizontal 17” stock monitors with screen tilt that don’t have issues with screen visibility, but this really helps out with 20” screens and vertical screens.