Place a single camera at the entrance of each public space and use the 'personcount' event type.

Place multiple cameras at different locations within each public space and use the 'personcount' event type for each camera.

Place multiple cameras at different locations within each public space and use a combination of event types, including 'personcount', 'loitering', and 'trespassing'.

Use a single camera at a high vantage point and use the 'motion' event type to detect movement.