I am curious about two things with regards to these laptops. Can the keys come in contact with the screen when closed, not just sitting on the desk but upside

I am curious about two things with regards to these laptops. Can the keys come in contact with the screen when closed, not just sitting on the desk but upside down/etc. When closing the laptop to turn it off is heat passively dissipated properly? Metal lids would seem a good way to trap it.