I can switch to cloudflare DNS in Firefox to circumvent DNS routing which is occasionally necessary, mostly to make email links work.
On Apple TV, I have the NextDNS profile installed, but it still doesn’t work.
Most of the community forum posts on NextDNS don’t get any answers. I’m sure the DNS servers exist, but the clients and the configuration options have not been supported by the creators.
I wouldn’t recommend NextDNS to anyone because of this apathy by its creators.
So I threw the router out the window, and signed up to rent CPE from my ISP; edge router security is now 100% their responsibility!
I've never had the former happen, but it's something to be aware of.