I run Pi-hole off a RPi Zero W on my local network. Set it up over Ethernet with a bit of cron automation [0] and later expanded Gravity (the blocklist) along with firewall NAT rules to redirect all DNS queries to go through the Pi-hole [1].

[0]: https://paul.af/adding-pi-hole-to-my-local-network

[1]: https://paul.af/pi-hole-revisited