I have my Logitec webcam on the screenbar, and there is a special mount for it, also from BenQ, which works perfectly!

I would rather not do that. Then I'd rather have a (mini) camera in front of/underneath the monitor. My 32-inch monitor has 10 cm of space on the left and right, so theoretically a camera would fit...

Not at all. I have mine next to it on a speaker.