I use a ergotech freedom a long time ago and use it for my 5lb 27 inch Korea 289k monitor.
Damn they have gotten expensive. The price is almost 2-3x what I paid in 2016.
I asked the same question 4-5 years ago.
Here’s pic I took when I first got it
Having moved multiple times, I appreciate the arm and desk mount being separate as it makes it a easy 1 person job. I usually mount the desk mount to my table then my arm to my monitor. Slotting the arm in on lighter monitors is a lot easier than trying to fiddle with the vesa screws.
I actually asked a while back for larger monitors
It is more challenging to line up the holes with the ergotech solution as my 43 inch monitor is significantly heavier. I’m also on the edge of the weight limit(~1-2lbs under), so my advice is to give yourself 5lbs of extra capacity (which I have with my 27 inch) if you want to adjust the height more. I might buy an arm suggested in that thread as my 43 inch monitor is at the weight limit and is very wobbly.