Start with the paths people actually use
Front door, driveway, side gate, backyard, and garage coverage are the usual starting points. If someone can approach the home without crossing one of those views, the layout probably has a blind spot.
A second angle can matter more than another camera. For example, a driveway camera may show the vehicle while a front-entry camera shows the person walking toward the porch.
Think about faces, plates, and movement
Wide overview cameras are useful, but they do not always capture identifying detail. The best layouts mix broad coverage with tighter views near doors, gates, and parking areas.
Height matters too. Mounting too high can make footage less useful because you get tops of heads instead of faces.
Leave room to expand
If you may add a garage, backyard, or side-yard camera later, it helps to choose a recorder and cable route that can grow. Planning for two extra channels now is usually easier than rebuilding the system later.
A real number from a recent job
For reference, a recent North York custom home got six exterior cameras on an 8-channel NVR. That leaves two channels free to add cameras later without replacing the recorder.
Related questions
Is four cameras enough for a home?
Four cameras can be enough for many homes when they cover the front door, driveway, rear access, and side path or garage. Larger or corner properties may need more.
Should I buy an eight-camera kit?
Only if the property needs it. A smaller system with better placement can outperform a larger kit installed in the wrong locations.