I've been using a PiHole for years now. It's super easy to set up. In practice, it's been the most reliable thing I keep on a pi. Technically, you don't need to host it on a raspberry pi, but you should host it on an always-on computer on your network.

Kind of a different way of looking at security; you can't guarantee someone's not keeping DNS logs, but you can guarantee that your DNS logs on a hard drive in your house aren't being shared.