sorry don't understandIt’s always DNS.
is that for first and secondaryQuad 9 (9.9.9.9) is recommended. Some are privacy based, other blocks ads. Just depends what type of DNS you want.
what setting for both dnsAnother vote for Quad 9 (DoH)
No numbers I can't see
To input in to the Router settings for wifiAnother vote for Quad 9.