If anyone wants a tool to further systemize this, it can be worth looking into self-hosting AnonAddy[0]. You get a decent UI for managing and creating aliases (named/random/subdomain), which is useful if you want to manually add them and track which alias was used for which service.

They also have a hosted service with free and paid tiers[1].

[0]: https://github.com/anonaddy/anonaddy#how-do-i-host-this-myse...

[1]: https://anonaddy.com/