I first ordered the All-wood Scala Vilagio Romantica AS music stand and discovered once mounted it's too massive and the desk fix is too loose.
I then went for the Sonata CH model which has a metallic adjusting rod.
This one looks really fine and nice (except the metallic part), is robust and perfectly suitable for guitar & cello playing (in sitting position).
Besides, I'd like to thank again the Thomann Team for helping me quickly and kindly to return the Romantica and to provide me with all the details about the Sonata.