On the dashboard (leftmost button on the bottom), you should have the Smart Home Monitor. If you go through the configure for that, you should see the place to select a camera. Check here for details: https://support.smartthings.com/hc/en-us/articles/205380154-Smart-Home-Monitor
No, I haven’t, although I haven’t really checked. Mine is sitting up on a high shelf. Checking now… Mine is warmer than room temperature, but definitely not hot.