Personally, I use 32" monitor on these:
BONTEC Single Monitor Arm Desk Mount for 13-32 inch LCD LED Screens, Height Adjustable Tilt Swivel Rotation Monitor Arm Bracket, Single Monitor Mount up to 8kg, VESA Dimensions 75/100 which I think I bought from Amazon.
They work OK, but it’s a wrestle with allen keys to make adjustments.