One installation works on several SoftetherVPN servers as long as the HUB and password is the same. 

If you have several VPN hubs and different passwords you can contact us and we can see if we can work something out. 

The license only works in one folder, on one server and on one domain. So you can not use the same license on several installations. 

If you need to separate the data you will need one database and one license on every installation.