I am trying to get some ethernet connections in a couple of rooms of a condominium. I have tried to use ethernet over powerline adapters but have had limited success getting them to work; I suspect that power outlets are on different circuits. I have read that you can buy coaxial cable adapters and run ethernet over the coaxial cable. Can I use these to run ethernet over my Hopper 3 and Joey 3 cables without causing problems? Anyone doing this?