Actually this is possible with TLS, by editing 2 files.
First, In the Slate Panel, set DNS to ENCRYPTED/TLS/CloudFlared. This will allow you to edit Cloudflare TLS stubby files, and turn it into Adguard by using the steps below.
/etc/stubby/stubby.yml
/etc/config/stubby
In these files, just replace the auth name with (find it in adguard, devices, your router) & the auth IP addresses (IPV4 & IPV6) with the info you got from AdGuard.
Should kinda look like that in the end. Then just reboot your router & ur good
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