Any recommendations for 'discreet' wifi front door security cameras?

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28. You don't need to "install" a motion detector system for backyard if...

you already have a porch light. Most homes have an outside light and an inside porch light.

For less than $3, you can buy a radar operated light bulb which simply screws into existing socket. Buy a pack of 3 or 4 ($12) of those on eBay or Amazon or Home Depot web sites and screw them in every outside existing light socket. They work great. I even have those in my hallway so when I get up at night to pee or get a drink of water, it lights up automatically. These light bulbs shut themselves off during daylight.

What is good about radar based motion detector bulbs is they do not need direct line of sight.
For example my hallway light bulb can not be seen from my bedroom door. But as soon as I walk out of the bedroom door, at night, the bulb lights up. Then after a short time it automatically shuts off. Until it detects more motion from me or anyone else.

If interested, do a search on eBay using "radar motion detector bulb".