4K capture device that will work with Mac or Win

i have three JVC 4K cameras (HDMI), and would like to stream in 4K next sports season. As of now, I don't know if I will be getting an M1 Mac or stick with a PC. Is there an external switcher that will work with either platform?

I was looking at an ATEM Mini Pro, but saw in the Q&A that it scaled 4K input down to 1080. 

This is for a small high school--I can't afford a pro-level switcher.

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