Their/There, Potato/Pototo
From what I have read and understand. Ziply Fiber isn't associated with Frontier Communications and is part of Northwest Fiber. As Frontier declared bankruptcy and solds its assets to Ziply Fiber. And as far as I know, Ziply Fiber only offers internet and Phone service. TV has to be streamed via a TV Streaming service like Youtube TV. I had Frontiers TV Service for a while but I had there Router connected to my router. It has been a while but I remember something about there cable boxes only needing coax from there router for the channel lineup, the TV signal went through the coax as well but was direct connected into a splitter. As long as you forward the correct ports to there router from yours, you can just plug there router in like its another connection on the network on your router.
I don't know how your setup is, but it sounds like you still have coax coming in to provide your internet and not from a ont? I don't remember if Frontier installed my ONT or if Ziply Fiber did. But my current setup is a Fiber Line from the pole to the ONT in my garage, then from there its a Ethernet Cable to my Asus RT-AC68U and phone line from the ONT to the office printer because someone still wants to be old and fax. I don't use cable boxes any more because it is cheaper to use Youtube TV service and Roku's.