Extended Network From NVR To Cable Modem?

Have come across an issue regarding a cable network to a residence. The main modem is on the third floor of a residence and a NVR is in the basement area. It is very difficult to run any type of wire to the third floor of this residence. I have tried power line adapters, wireless network works, with no success to connect NVR to the LAN. There is a coaxial splitter in the basement near the NVR which I believe provides internet to the modem. Would it be possible to next another cable modem to this location and connect the NVR into this? Any other ideas would be very helpful. Thanks

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