Messaging Gateway in a DR scenario

I am looking at implementing Messaging Gateway in a DR solution.  I am not currently using the product.  I'd like to know if the following deployment scenario is feasible\best practice.

2 data centers.  Philadelphia is the primary with a Control Center module and 2 Scanners with highest weighted MX.

Denver is DR center with 2 Scanners with lower weighted MX. All mail routes to Philadelphia unless it goes offline.

My questions:

1. Can I have a control center module in the DR location that is 'offline' unless the primary control center goes down?

2. If a 2nd 'offline' control center is not an option what is the suggested deployment for a DR scenario with one active and one passive location?