The AM420B is compatible with 2 AOC 25G42E monitors as the mount supports up to 2 monitors with a maximum size of 34" and up to 9 kg per monitor. The 25G42E has a screen diagonal of 24.5" and weighs well under 9 kg, so both monitors can be mounted without any problems as long as they are equipped with VESA 75x75 mm or 100x100 mm.