I have heard mixed things on the needing of SURGE on the cable line.
I think while Generally you should be ok... I have seen it fry a cable modem before.
Actually then took out the network card as well on the PC it was connected to.
May depend, on how your lines are.
"isn't needed for the cable because Rogers already provides all the grounding and protection necessary" as oldyellr said..
The rogers line, SHOULD be grounded outside the house. Normally in the rogers connection box that is by your power meter.. there should be a connector in there, which is grounded, usually to the outside of the power meter.
Now, if this isn't present... then much more of a chance, etc.
Rogers Ignite Xi6, LG 47LV5400 LED TV, Yamaha