Hello both and thanks a lot for your answers 
After thoroughly searching I found some similar cases which contained some solutions for accessing those paths through sftp instead, like here in the forum and here in ynh’s documentation.
At the same time now I’m facing some troubles for accessing a calibre database on the server through calibre desktop app… again for read/write permission issues, but very weird. Different topic but if you feel to give a look at it I’d be glad! I’m posting it here
Thanks again