External activation from 2 databases on same server

I am struggling with getting external activation to work with 2 databases from the same server. Up to now, we have just performed external activation from a single database!

Scenario is as follows

DBServer1:
- Database1:
-- Service Broker Service: //DB/ExternalActivation/Service
- Database2:
-- Service Broker Service: //DB/ExternalActivation/Service

In the EAService.config of the Service Broker External Activator I can only reference one of these databases:

<NotificationServiceList><NotificationService name="//DB/ExternalActivation/Service" id="100" enabled="true"><Description>Service Broker external activation notification service</Description><ConnectionString><!-- All connection string parameters except User Id and Password should be specified here --><Unencrypted>server=DBServer1;database=Database1;Application Name=Service Broker External Activator Service;Integrated Security=true;</Unencrypted></ConnectionString></NotificationService></NotificationServiceList>

My event notifications are:

USE Database1
GO

CREATE EVENT NOTIFICATION EventNotification_DB1_Target_Queue
    ON QUEUE Q_DB1_Target
    FOR QUEUE_ACTIVATION
    TO SERVICE '//DB/ExternalActivation/Service', 'current database';
GO

USE Database2
GO

CREATE EVENT NOTIFICATION EventNotification_DB2_Target_Queue
    ON QUEUE Q_DB2_Target
    FOR QUEUE_ACTIVATION
    TO SERVICE '//DB/ExternalActivation/Service', 'current database';
GO

Do I need to look at routing the event notifications away from the services on the local databases and if so is what I am trying to do logically the same approach as 2 separate servers regarding the service broker set up?

It was much more fun when we were doing this using a single database :)