2 Modems Not Possible, Alternatives? - Time Warner Internet

This question is about "2 Modems Not Possible, Alternatives?", with Time Warner Cable internet and apps. I have no ethernet jack in a back office of mine and need to hard-wire my internet via ethernet cable. I'm not taking the risk with wireless/wirless connection is extremely poor in that area. Wireless is out of the picture.

I have a coaxial chord the back office, but two modems is not an option either.

Are there any other coax to ethernet converters out there?

Could a cable guy come out and wire through the house somehow? Aesthetically, it can't be be visible, so it would have to be hidden in the walls. Is this possible for a regular cable guy?

The wifi modem is all the way in the basement.

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