vpn client you login avg vpn have all devices use the vpn & doh at the same time improve security & speed acroos the whole network

yes just firmware update to use the feature yes it should work though many models

DNS-over-QUIC is a new DNS encryption protocol and AdGuard DNS is the first public resolver that supports it. So what's good about it? Unlike DoH and DoT, it uses QUIC as a transport protocol and...

AdGuard DOQ dns over quic improved performance Encrypt DNS traffic

yes use the wan port & one of the lan ports together

yes mesh mode & router mode are emvled it lasted a couple days then lost the wifi seting on both devices rourter ax 73 ax10 i had shurdown the ax 10 get the network working again