Quick update.
I bought the 3rd Helix 9 G4 MDI CHO unit. I don't need the transducer. I mounted the third unit to the bow and hooked my MLive directly to it. Everything works perfect in the garage. This weekend I'll test it all out on the water. If that goes well, I'll install the 2nd Ethernet port. I have 1 port mounted by the console, and was going to mount the second next to it. However, after thinking about it, I think I'll mount the second ethernet port on the bow and run both bow sonar units and MLive to it, then run it to the console ethernet port. Leave the console sonar unit connected to the console ethernet port. I did read on HB website that the One-Boat-Network can only support 4 Helix units and only 1 of everything else, with a max of 3 ethernet ports. Time will tell.