kisshomaru on "[Plugin: WordPress MU Domain Mapping] Does the plugin work if the multisite is installed in a folder"

Hi, I have the wordpress multisite installed in a sub-folder, would this work? I read conflicting threads on the matter.
I installed the plugin, configure it and put a dns record, but doesn't really seem to work. I wonder if this is why?

https://wordpress.org/plugins/wordpress-mu-domain-mapping/