Additional tv box setup

We just switched to xfinity and have the XB6-T and XG2v2-P set up on our “main” TV (where the coaxial cable is connected). We were told a second tv would just need a wireless box to have xfinity tv. (I don’t want to use Xfinity Stream on that second tv - I want the same functionality as the main tv - pause, rewind, etc.) The box that was sent to us for the second tv is the xg1v4-A, which seems to require more than just an HDMI connection to the tv. Is this the wrong box? How do I get xfinity tv on a second TV without a coaxial cable connection?