Who Me Too'd this solution

Sorry for the delay. So from your ONT there should be a coax going to a main splitter. Then the outs will go to the STBs and FNA. Ethernet from ONT will go to the Archer WAN port. Then one of the Archer’s LAN ports will connect to one of the four FNA ethernet ports. I has the same adapter so it will definitely work. Verizon just doesn’t support this configuration which is why they say it doesn’t work. I’ll draw diagram and post it shortly.