Max weight for The W1 desk attachment

Hey all!
A bit of an unusual question but I was wondering if you know or saw an official spec listing a max recommended weight for this one: https://walkolution.com/products/desk_attachment

I indeed wonder how many monitors arms it can support, maybe a desktop PC underneath etc.
I know it's kind of a subjective question too but mostly wish to maybe know if people are having some heavy gear on it.