Works nice, also it could be useful for root admin, to use.
Also the default Folder Location should be written by default /usr/public_html/ not Folder Location and if there something in there it should show notification or be in different color, example, red. If it is ok, its green.
/usr/public_html/ previous site install
/usr/public_html/ empty location, good to go
And also a field of the Notification, chose other place, Do you rely want to overwrite this location?
I hope you got the idea, that would only help site admins to ignore situations of user low knowledge and help us relax a bit more!