Can multiple tenants be registered for the same property?

Yes, multiple people can be registered for the same property without affecting each other as they won't be able to see each other within the system.  You can have roommates each register and submit their own separate payments if needed as there isn't a limit on the number of registered users.  You could also have a new tenant register and submit a payment, such as a security deposit or application fee, while the current tenant is still registered without affecting each other.