I'm just using a cheap hydraulic monitor arm that I got from Lazada. Loop Alloy's the name. The size of the monitors are 34-inch for the primary monitor and 27 for the portrait one. Btw, I've since put the primary monitor on its own monitor arm as well. Also Loop Alloy, except it's the regular steel one since that monitor's much heavier (13kg; the hydraulic one can only carry up to 8kg).