Wonderful day!
It's indeed a charm to have a few of workspaces with monitors in portrait standing, especially for source code or chats/socials!
There's a few at works I have at certain places and some in apartments, and if you are searching for a few, I would recommend Humanscale (e.g. M8.1) I trust, and the most of Ergotron, which should be available and are both steady enough that I haven't even had to re-tighten them since the first time I conveniently positioned/mounted them at places, years ago!