Populate 2 DNS objects with the desired DNS server addreses and then pin them to the DNS section for number 1 & 2.
Then you'll want to make sure you use those same objects for the DHCP servers you create, unless you want to create a DNS relay, then you'd use the LAN IP as the DNS server for the DNS server in the DHCP server config.
( You'll also need a SAT/NAT combo for each of the public DNS servers, but there's more on that in the help file for the DFL)