An Adobe resellers should work with you to find the best particular option in your particular circumstance.
This page gives some additional information about the option:
Adobe Creative Cloud™ Team Ready is a Transactional Licensing Program (TLP) offering for small and medium businesses as well as teams within larger organizations. Businesses that purchase Creative Cloud Team Ready get immediate access to CS6 Master Collection plus access to additional tools and services, including Adobe Edge, Adobe Muse™, and Adobe Photoshop® Lightroom® (coming later in 2012), when they are available. This offer is available through Adobe's reseller partners only.
The Creative Cloud Team Ready offer will be available on May 7, 2012. The same date as Creative Cloud Membership. This will enable Adobe Volume Licensing customers to purchase a 1-year subscription to the CS6 Master Collection now, and then when the CCM Team offering if available, they can migrate easily from the CS6 Master Collection to the Creative Cloud Team.
All subscription products do connect to the internet once a month in the background to confirm the subscription status but this could just be added as firewall exception like you described.