How to install WikiSuite documents a typical installation. But your needs can differ.
How to override for a specific site?
post_max_size = 1000M memory_limit = 4000M upload_max_filesize = 1000M display_errors = On error_reporting = E_ALL
To do: document way to override for whole server. Ex.: a dev server could have always at on, or per site.
Virtualmin -> Services -> PHP-FPM Conifguration -> Error Logging -> Display error messages