if you're not on a super tight budget, and have LOS, you can put together a solar solution, using wireless bridge to throw wifi out to each remote spot. then you can use any WiFi camera you want.

https://www.amazon.com/UeeVii-Outdoor-Wireless-Transmitter-Distance/dp/B083QCRS2V/

https://www.amazon.com/SOLPERK-Maintainer-Waterproof-Controller-Adjustable/dp/B08XYY5CDM/

these are just examples, i haven't used either.