My video conference rig is a Micro Studio Camera 4K, Video Assist 4k, and Arduino shield all going into a Decklink card on an Ubuntu desktop machine. The Studio Camera, Video Assist and Arduino shield all get pretty hot, so I don't run them continuously. The Video Assist does weird things when it's hot like having the audio meters stop working, even though it's still transmitting audio to the SDI output just fine.

That said, the Decklink has been rock-solid in the 5+ years I've owned it and we had a VideoHub at a past workplace that worked great. I actually recommend all the Blackmagic stuff I've worked with, but have seen heat consistently been an issue.