The name for the router is FRITZ!Box, not FritzBox.
When setting up the FRITZ!Box in the device setup instructions, it has 2 options:
Using your router admin panel, and
Using DNS-over-TLS
Using DNS-over-TLS probably doesn't need to be a seperate section as it's also including within the router admin panel, on the same page as the plain server addresses.
Here is an attachment of what the FRITZ!Box DNS setup page looks like.
I would suggest either separating it in to 2 distinct sections for plain server addresses and DoT, or have it all one page following a similar format to the FRITZ!Box DNS setup instructions.
Under the DNS-over-TLS setup page it gives the tls:// address to use, however the FRITZ!Box is not compatible with the full address and must have the tls:// redacted from the full address, instead being something like xxxxxxxx.d.adguard-dns.com, and not tls://xxxxxxxx.d.adguard-dns.com.
Here is a visual of what it must look like:
Using DNS-over-TLS probably doesn't need to be a seperate section as it's also including within the router admin panel, on the same page as the plain server addresses. Here is an attachment of what the FRITZ!Box DNS setup page looks like. I would suggest either separating it in to 2 distinct sections for plain server addresses and DoT, or have it all one page following a similar format to the FRITZ!Box DNS setup instructions.
tls://address to use, however the FRITZ!Box is not compatible with the full address and must have thetls://redacted from the full address, instead being something likexxxxxxxx.d.adguard-dns.com, and nottls://xxxxxxxx.d.adguard-dns.com. Here is a visual of what it must look like: