The same number of DR Option licenses as physical servers on which the switchover target L-Servers are operating are required for either the switchover source site (in the Active-Standby operation), or both the switchover source and destination sites (in the Active-Active operation).
In both the Active-Standby operation and the Active-Active operation, use the same licenses (as many DR option licenses as you purchased) for admin servers of switchover source and destination sites.