A home doorway surveillance camera is the wrong unit of thinking

A video doorbell has a narrow motion cone pointed roughly straight ahead. The loiterers property owners worry about, people who knock, step back into the dark, and wait to see if anyone is home, quickly learn where the cone ends. Two feet off-axis and they are invisible to the doorbell. A multi-angle setup (porch cam, side-gate cam, driveway approach, package drop, garage corner) overlaps those cones so any approach path triggers at least one camera. One camera solves detection in theory. Three to six cameras solve it in practice.

You can add AI to the cameras you already own if they route through a DVR or NVR with an HDMI output, which covers almost every wired security system sold since roughly 2012. An edge AI device like Cyrano plugs into the recorder's HDMI port, reads the multiview signal, and runs detection on every camera tile at once. No camera replacement, no rewiring, no cloud subscription. One device handles up to 25 feeds, which is far more than any single-family home needs.

Start at 60 seconds for the porch and package zone, and 30 seconds for side paths and gates. 60 seconds filters out delivery drivers, mail carriers, and short-pause visitors. 30 seconds on side paths catches anyone who shouldn't be there at all, because legitimate traffic on a side gate is rare. Expect to re-tune after the first week based on the false-positive log. If you get alerts on the mailman every afternoon, push the porch threshold to 90 seconds. If you miss a real loiterer, drop the side-gate threshold to 15.

Only if it is mounted at roughly head height or slightly above, angled down about 15 degrees, and 6 to 10 feet away from the door. A camera mounted up under the eaves gets the top of everyone's head. Doorbell cameras are mounted at chest height, which gets faces beautifully for people standing 3 feet back, but distorts them at point-blank range. This is the single biggest reason the multi-angle setup works: a wide porch camera at head height does what the doorbell cannot, and vice versa.

Cloud subscriptions upload video to a remote server, run AI there, and stream alerts back. This adds 2 to 5 seconds of latency per frame, breaks multi-frame persistence filtering, limits cross-camera correlation (each camera is usually processed in isolation), and costs a recurring fee per camera. Edge AI on a DVR processes all feeds locally at sub-second latency, correlates events across cameras, and runs on a flat monthly fee regardless of how many cameras you have. For a doorway problem, the latency and correlation differences matter more than most people realize.

In almost every US state, yes. A camera capturing activity in or near your own doorway, whether public-facing sidewalk, porch, driveway, or yard, is lawful. The exception is audio, which in eleven states requires all-party consent. The safest default is to disable audio recording and rely on video only. If the camera can see into a neighbor's window, reposition it. Doorway-facing cameras almost never have this problem.

Usually no, if your porch camera already covers where packages land. A separate package-zone camera is only worth it when deliveries drop on the side of the house, in a vestibule behind a screen door, or behind a pillar that blocks the main porch view. In those cases a cheap wide-angle camera pointed at the drop spot pairs with the rest of the system and gets the same AI dwell-time analysis. The point is that coverage is a design choice, not a product SKU.