I have attached a 34" with it, I think it should work without problems.

It makes a very robust impression on me. It should work. In general, it's a pretty cool mount for the price.

This mount has Vesa 100x100 and 75x75 (measured at the plate) and is quite solid and therefore looks very solid and stable.
It is around 90mm deep, and there are 4x spacers with 17mm for between the unit and the mounting plate.
The arm can be swivelled slightly to the left and right and can be aligned horizontally if the attachment is not 100% vertical.
The set includes 2 DIY dowels and a handful of Phillips screws and 2 Allen keys.

According to the packaging, this mount is suitable for up to 43" or 49" Ultrawide and a total of 20 kg/44lbs, whereby the supporting material probably also plays a decisive role.