InRouter305 Site-to-Site Connectivity

Looking for assistance in configuring a site-to-site cellular connection using the InRouter305. Is there a best practice for setting up this connection with this particular product? 

Do I need to use InConnect to successfully setup this connection?

Any feedback is greatly appreciated

InConnect would be the easy way to set it up. Or, you can choose one of the method under VPN, and build the tunnels from there.