Lookout runs on a desktop an office already owns, or on a Linux machine with Docker. The limit is that computer, not a camera count in the software. New footage belongs on a fast disk in the machine. Older days can move to a larger disk, including a spinning disk or a share the operating system has already mounted.
The yard example, a speaker that answers when an animal shows up, is on the features page. How many cameras fit is on the sizing page.