Regarding my previous post about MikroTik, DNS-over-HTTPS and AdGuard, there is one product that I actually used several years before.
I was using PiHole as DNS forwarder and DNS sinkhole of my main DNS servers (BIND). During 4 years using PiHole, I rarely experienced significant problems in maintenance, upgrade or troubleshoot process. In terms of reliability, I think PiHole definitely deserves a mention.