Zoneminder is a pretty solid setup for IP security cameras, and the zmninja app is really nice too. I had tried it years ago but got back to it recently with some sketchy IP cameras. I just put them in their own VLAN, no Internet access, Zoneminder does motion detection and event recording, and so far I’m quite pleased with it.
Yes! I have been running Zoneminder since 2020 with no complaints.
For first time/new users I would suggest one thing, try it in a VM first and take notes. Some of the settings take a little tweaking and when you have it all hammered out you can just follow your notes to set up your production machine. When I upgraded my server I was able to set up a brand new ZM instance with 8 cameras in about a half hour because I had my notes.