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Clicking around from your link you get to https://doc.powerdns.com/recursor/index.html
> A quad Xeon 3GHz has been measured functioning very well at 400000 real life replayed packets per second.
So that's more like 40 servers. Realistically the complexity of serving DNS is probably somewhere between Fortunes and Json Serialization in the Techempower benchmarks: https://www.techempower.com/benchmarks/#section=data-r21&tes...
So it's possible you could do it with 10, far less than you'd want for proper redundancy.
you can also have a look at nextdns [0][1]. I set it up on both my mac nad iOS. NextDns provides a panel where you can see what got blocked and some other analytics for you. Even though I use Brave on iOS and Arc with uBlock Origin still that wasn't enough and nexDNS blocked some additional ~8% trackers. It's free for first 300k requests per month.
[0] https://nextdns.io/
[1] https://github.com/nextdns