I think I have the same protectli as you and it is awesome. Need it for my 2.5gb uplink. I use openwrt on it... Didn't really like opnsense. I am more used to linux than bsd.
I host lots of services and get bombarded by scrapers, scanners, and skids both at home and on my VPSs.
I use ipset for the usual blocklists which I download regularly. I also have tarpits on 22/tcp (endlessh). I pipe the IPs from the endlessh logs into fail2ban which feeds the ipsets. I have ipset blocks and fail2ban on my home firewall and all VPSs and coordinate over mqtt. So any fail2ban trigger > mqtt > every ipset block
. Touch my 22/tcp anywhere and you get banned instantly everywhere. The program I use for this is called vallumd and it runs on openwrt.
I also put maltrail everywhere but I'm not totally sure how to interpret and respond to the results. Probably will implement a pipe from maltrail to my mqtt > blocklist setup.
I don't do any network-level adblocking... Might be a future project.