sitting on the front porch with a shotgun is the perfect private doorbell camera

and now that we're there... a dash-cam for the flintmobile anyone?

An attack dog with a go pro attached to them

I have an amcrest doorbell connected to a synology nas & it works well

https://nascompares.com/answer/best-doorbell-camera-that-works-with-synology-nas/

Ubiquity unify. Footage remains on your network.

But it requires a ubiquity router and IT skills.