If you're using a TLS circuit there may be no need for a second UTM as you essential have a really long private ethernet cable running between your two locations. A UTM at both locations would be an ideal solution if you didn't have a TLS connection. I deal with TLS and microwave circuits running from Canada into Vermont... We have don't use UTMs at the satellite locations as they don't have a real internet connection, just the TLS line back to the home office where our internet service is. You really need to have a conversation with Cogeco and your Sophos reseller on the right way to line up all of this equipment. The second UTM may very well be unnecessary unless you're trying to provide a way to switch to a backup internet connection should the TLS circuit go down.
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