Fortinet 60F & Static IPs: Need CBR2-T Config

Hello, 

Can someone please tell me which bridge mode to set in the CBR2-T config, so I can config a pass though for my Fortinet 60F firewall? I have a small block of statics that I'll use with the 60F for both WAN interfaces and VPN interface for remote access. Neither bridge mode seems to work for me. Is it possible to just get a basic DOCSIS modem? The CBR2-T with Cradlepoint sidecar is an overly complex mess that doesn't work anyway when 4G backup is needed. I'll happily throw out all of this junk if I can just find a way to terminate the coax/DOCSIS. 

Thx.