How to install monitoring equipment in green belt?

I know something about the monitoring system in our factory. Tell me about my suggestion:

Just set up a camera at the main entrance and exit (it can't be monitored inside the forest area)

How many cameras, video lines and a monitoring host are needed.

Beijing INSINS-Z128 This camera costs about 3,000 yuan in all directions (directional cameras can be cheaper), and it can be seen clearly from several hundred meters to one kilometer. 8,000 yuan is enough to monitor the host.