I think it comes down to the difference between eye lines and distance more than anything like the camera's placement above or below the screen. With a laptop a

I think it comes down to the difference between eye lines and distance more than anything like the camera's placement above or below the screen. With a laptop any location the difference between looking at screen and camera is pretty drastic because it's pretty close to the user. In a conference room people are generally much farther away and smaller so it's harder to see the difference between looking at the screen and the camera.