I got my D-Link TA from AT&T yesterday and installed the box, got the required updates for it and then tired moving it behind my router, but that mission failed. I tried a variety of things, but no luck yet. Perhaps in a subsequent update. In speaking with customer support, you are supposed to be able to move it once it has been addressed and configured.
In any case I am looking forward to my last bill from Verizon this month and saving about 50 bucks each month thereafter.