Ubiquity or alternative?

Hello? I have an unRAID server that runs

- plex

- Nextcloud

- general nas storage

- misc apps like boundary.

I have a handful of smart home devices

I have 3 computers I want to be in WiFi.

Ideally I’d like to have the unRAID, private, and smart home devices in a separate networks.

I also currently have 2 dead spots in my 1300 square foot apartment, lots of thick walls. I don’t mind wiring.

Is ubiquiti + an AP worth, is this acocompkishable with my router (one of the netgear nighthawks) and unRAID?

Any recommendations? Networking is a bit outside my knowledge area.

Thanks.