This is a feature that dnsfilter.com offers and it would be amazing to be able to apply different black/whitelist based upon the DNS request source network/subnet.

This feature allows multiple policies to be enforced within a single network. By enabling this feature, you can assign alternate DNSFilter IPs to specific devices or endpoints via DHCP, DNS forwarding or direct assignment. Example use cases include data centers, guest Wi-Fi and executive devices.

By selecting one of the DNS Server IP sets below, any DNS requests sent to the selected IP addresses will have this policy enforced instead of the primary policy for the network.