NextDNS (2 separate accounts) on same router

Hi all,

I was impressed with the speed of the DNS servers so I decided to use them in my configuration, but I have some doubts and issue.

I would gently ask you for some information needed for correct use based on my configuration:

- Router with two separated WAN attached in

- Every WAN serves separated WG tunnel (wg0 <--> wan1;  and wg1 <--> wan2)

- With policy based routing I route first NextDNS account dns query over wg0, and second NextDNS account dns query over wg1

- I use Adguard Home allow me for blocking domain based on separate vlans and/or hosts

QUESTIONS:

What is the correct configuration for AdGuard Upstream Server?

Do I need to use just ipv4/udp for separating policy based routing?

If I try to set https the servers don't work. (even with PBR with steering.nextdns.io point to wg0 wnd wg1)

Can you advise me on the best solution to adopt based on my needs?

Thanks