Opt out of Censys data collection

Recently an IoT scanning company, Censys, has been scanning my network. They have an opt out whereby known IP addresses are added to a routers firewwall (see https://support.censys.io/hc/en-us/articles/360043177092-Opt-Out-of-Data-Collection).  Trouble is I can't work out how to do this on an R8000P. Any help would be appreciated. I have Armor also and can't find anything in there either. Unfortunately I have a few Rasp Pi's with ports open via port forwarding which Censys are finding. I know I can use the PIs firewall to block incoming scans but wondered if I could do this at the router level.

Regards