We will soon publish the plans for the next 3 releases of Collanos planned to be available early November, January and March. Using one Collanos Name for multiple instances (kept in synch) will be addressed in there.
At the moment you need to have a Collanos Name for each of your installations and then invite all these instances into the workspaces.
A workaround that at least allows to have all installations kept synchronized. For this reason other features were higher in priority.
For sure you can use the same email for each of your different Collanos Names.
I hope you have the patience with us and keep on working with Collanos. We are going to get this "last" gap

to solutions like Groove and Sharepoint closed soon (and we will add many new features).
Cheers
Peter