I make my changes in the web client I access from the primary controller. The label on the interface is Mobility Controller. To date all I've had access to is adding devices to the whitelist and using instant to deploy them.
If I'm not mistaken when you ask about the topology I think you mean the following.
City one,
Primary Controller - Master
Secondary Controller - Slave
City two,
Primary Controller - Mirror of City one Master
Secondary Controller - Mirror of City one Slave
Meat
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