A:AnswerDepends on size of the surge. Small surges will be disapated but large surges could blow out the unit which will prevent them from reaching your equipment. They have a limited amount of life and the indicator will alert you to unit failure.
A:AnswerTheoretically, you can but why would you?
Run a Cat-5 cable out of your Router and into Power line adapter and plug it into any standard power wall outlet.
Plug in the surge protector and run a cat-5 cable out of the unit and plug it into your TV.
That's what I did. It worked for me.