I want to install Wordpress to a subdomain (sub.example) but want to serve it on the subfolder (example/sub).

I want to do this because the root domain (example) is a different web app so installing WP to subdomain is better to manage.

I read several articles about proxy / Nginx etc. but want to know how to organize this structure from the beginning. I mean if there is anything I should be careful about for this structure because I know the WP installation will be served on different URL.

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Install: sub.example | REDIRECTION | Serve: example/sub