Good product, but beware

Good good heavy metal, it inspires confidence unpacking :)
I fixed my first screen (24 "3.4kg), no worries.
By cons, wanting to put the second (24 "8.3kg), it is less well.
Already because of the imbalance of the weight difference, it inclined towards heavier (normal :))

But it also leaning forward. So I just ca dismantled before falling.
There was a mark on the desk top and bottom at the location of the clip while the system remained in place 10 min.

So, I doubt that the media can operate with 2 screens of 10kg as mentioned in the description.

It remains for me to install reinforcements to avoid making a hole in my office (a metal plate above and below), and either change the heaviest screen or to a support underneath.