Connecting Tivo Roamio to cable

Hello, I have a Tivo Roamio and a Comcast/Xfinity modem. I need to connect my coax cable from the wall to the Tivo AND from the wall to the modem to maintain internet access. Do I just need a 2-way cable splitter? Do I need a POE filter and/or components for MoCA?

Or do I need something completely different? Sorry not my strong point and neither Comcast nor Tivo have been any help.
Thanks