Deploying a new Internet Gateway in an Active/Active scenario

I am looking at setting up another internet gateway for our Executive Branch office.  We currently use a Web filter and Network agent at our core where all internet requests are handled.  My question is I guess two part:

1. Do I need additional licenses to monitor two gateways, i.e. two network agents and Filters?

2. Do you recommend I use a dedicated Network Agent and Filtering Server at each site? Or, will the impact of sending the requests to the existing Filtering server over our MPLS 50mbps circuit be minimal?

Any info is appreciated.  

Thanks,

Brian