So, if I'm reading this right..... unraid is probably the NAS software I want to use if I want to incorporate docker instances for things like plex/kodi/jellyfin, or am I better off just doing those on a second N100 mini-pc?
I own 5 unRAID licenses. It is a "set it and forget it" type of setup for me and honestly, doing over IT since early 2000s - I am no longer in the mood constantly troubleshooting stuff for basic media functionality.
TrueNAS (Scale) is a good alternative as well, but it has it's own twerks.
I'd recommend unRAID or TrueNAS for your media and backup stuff.
For a hypervisor I run proxmox, love it (originally was on VMWare ESXi).
For my router and some home ids/ips I use a mix of opnsense with suricicata and sophos firewall xg (home edition).