WordPress of Multiple directory to be shown in root. Multi-site will work too.

WordPress of Multiple directory to be shown in root. Multi-site will work too.

I want to show WordPress installed in multiple directories in root website.
example: https://www.example.com/wordpress1/* in https://www.example.com/*
& also https://www.example.com/wordpress2/* in https://www.example.com/*
for one site its working fine by the method posted in Giving WordPress Its Own Directory

this method is fine if there is a way to define condition to require( dirname( __FILE__ ) . '/wordpress1/wp-blog-header.php' ); to switch between wordpress1 and wordpress2 and so on..

WordPress Multi site will work too but hast to show all post from all sub-sites in root directory just like example one.
There will not be any duplicate content within sub-directories or sub-sites.

WP-ADMIN could be opened at conventional way like: https://www.example.com/wordpress1/wp-admin/*