I bought a piece of 1.5 inch stiff foam to try to fix a sag in a bed. It didn’t work but having that thick piece of solid foam around has been a life saver.
Need something flat to put a laptop on? Throw it on the foam. Going to be doing something that requires you to be on your knees for a while? Get the foam!
It went from stupid purchase to something I’d gladly replace if it broke.
Honestly, I don’t think you’d have any concerns with finding some that are suitable, those are the sizes of monitor that the overwhelming majority of the stands are made for. Monitors get absurdly large now.