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Did you set it up on your router level? I thought I’d have to set it up device by device
Not the person you asked, but also a nextdns user: I have a light (in terms of blocking) profile on my router (set up via a DoH address, but DoT and traditional DNS are also possible). Then I have a much more strict profile I use just for my phone and laptop with more serious blocking, including porn filters (recovering addict). I set these up per-device, but later I learned I can do it in Tailscale (which I did).
If you can block all DNS traffic on you router, you can them redirect it to your own DNS server.
And PiHole seems to be the one many people use for that. Lots of guides for it, pre-made list on what to block etc.