A multi-head camera puts two or more independently aimable imagers in one housing on a single mount and cable run. Each head is its own channel with its own lens and field of view, so one installation can cover a corner, a door and a lane at once.
The appeal is fewer mounts, fewer penetrations and one cable instead of four. The catch is that every head still needs its own bandwidth and storage.
Where the format earns its place
Poles, building corners and parking decks are the usual sites, because the hard part is the lift and the conduit rather than the camera.
Specify per head, not per unit
Count the total bitrate and power for all heads, confirm the recorder supports the channels, and check whether the lenses are fixed or adjustable.