Need xfinity X1 voice/wifi compatible Modem/Router with NAT Loopback capability

[Nighthawk Pro Gaming]

Currently using Xfinity provided (leased) Cisco DPC3939. I am on the 150Mbps DL tier. I have X1 Quad Play internet/voice/TV/Security. I need NAT Loopback capability, which NONE of the currently available Xfinity X1 provided modem/routers have. I understand that the Nighthawk line of Netgear modems do.

 

Given my needs, what Nighthawk combo Modem/Routers will work with Xfinity/Comcast *AND* have NAT Loopback capability?

 

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