There should be a green grounding wire in your low voltage box. The units you linked to appear to not have a connection for ground. Here is what I use and have recommended. Rated better than what the cable companies install. Install it in the low voltage box where the cable comes into the house. No need to add any at each component in the home.
Siemens FirstSurge Coaxial Cable Protection Device
In this case, you do get what you pay for.
Data Sheet