How many cameras in a camera trap?

So.. noting that definitions are a little loose, I am talking about a single GPS location as a "camera trap" (TEAM calls this a "camera trap point")

Generally, I have seen only 1 or 2 cameras in a "camera trap" in the literature. Are there any scenarios where more than 2 cameras would be desired?
And how frequently would those scenarios occur?

(NB: I am excluding scenarios where a camera is replaced)