Customer router behind edgerouter

Edgerouter - primary router

Sonicwall - secondary router.

Block of 5 assignable statics from Comcast

I have configured all statics on eth1 of the EdgeRouter

Need to put the Sonicwall behind the edgerouter on eth2 and give it one of the statics. I can get get this to work by NATing the static to a internal IP and give the internal IP to the Sonicwall  and connect it to eth2

I would rather the customer just put in the Static IP info in the WAN interface of his Sonicwall.  So somehow I need to passthrough anything for their static to the eth2 without using a private IP.

Any help would be appreciated.

Thanks