Since webinoly does not support subdirectory installation without multisite, I installed wordpress manually in a subdir.
I am using fastcgi cache and the subdir shares the same nginx virtual host with main domain. The cache in subdirectory is able to be updated when in a post or page is added new text even though I have not installed nginx helper plugin in wordpress subdirecoty?
For now things are going well. As you know more than me: should I install nginx helper plugin also in subdirectory?