Usually the ethernet cable is not a problem as long as it stays in the building. Where we used to blow stuff up was when the ethernet ran between buildings. I am not even sure those strips would fix that problem. We made the problem go away with a fat bonding wire that was significantly shorter than the ethernet cable, bonding the machine frames together.
We also clamped ferrite beads on the ethernet cable at each end.
There was some engineering dispute about how that worked, but it worked. The basic idea came from the State Farm data guys in Winter Haven on parallel printer cables but we adapted it to ethernet.
