I've used 3 self-hosted solutions and all work pretty good:

Synology was probably the "most polished w/ features" but only 2 cameras out-of-box for free, thereafter $25 per camera (one-time license)

security

What are the best home security systems / cameras / monitoring recommendations?

HardMoney

I've used 3 self-hosted solutions and all work pretty good:

* Zoneminder
* Synology 
* Home Assistant

Synology was probably the "most polished w/ features" but only 2 cameras out-of-box for free, thereafter $25 per camera (one-time license)