Idk about that @GHOST I'd say FOSS operating systems for your phone and PC is the most important step. You don't need to filter and block malicious tracking domains if your devices don't ping them in the first place. It's also a losing battle to try to counter iOS and Windows tracking from a routers perspective. A simple VPN on Linux or GrapheneOS basically destroys nearly all vulnerabilities with even the most malicious networks. It is a very important step, but FOSS OS is the most important, and most impactful.