I’m using a Tobii with a 35″ curved monitor (Asus). The tracking becomes unpredictable on the edges of the screen, but the likelihood of focusing at that extreme, I’ve found, is pretty low. (I’m playing a lot of Elite Dangerous, and the eye tracking moves the Infinite Screen before you’re looking at the extreme edge anyway.) I haven’t seen an issue with regard to the curvature of the monitor.
As for mounting. I’m using a couple of velcro pads at the ends of the Tobii, rather than the magnets. Not as nice, but it works fine.