Ac adapter

Hi , I have a netgear router provided by COX for my HOME LIFE security system.

3 camers and 8 sensors + a door lock are connected via WIFI to the router.

I am loosing many times the video stream from 2 cameras, one is like 100 feet and the other like 40 feet from the router.

COX tec' offer to install Ethernet over AC to those cameras.

What kind of transmiter that will be conected to the router by ethernet and pluged to the AC I should choose ?

What kind of recivers connected to the AC near the cameras (2 diffrent locations) and linked to the camera Ethernet RJ 45 I need to choose.

I need to buy one transmiter and 2 recivers.

Tnx