What's wrong with their NVRs? I have one connected to some Reolink cameras (though not yet the full house-surrounding setup I have planned) and it seems fine so far.
Reolink with Synology NAS using their native Surveillance app. All stored locally, no cloud.
One issue with Reolink I haven’t solved is that it is unable to detect approaching cars in the night. Departing cars work fine though. Otherwise no complaints.