Honestly I have never considered that, but its a good question.  The setup in the house is like this: in order of source:

1 Router with Wifi Disabled (Its not available for WIFI unless the admin settings are changed using the modems web interface.  Note that the router has a plastic casing.

2 A shielded cable at both ends (one end in the LAN port of the router (shielded end connects with the plastic casing port)

2a The other end of the shielded cable goes into a metal casing Ethernet gigabit switch.

3 Another shielded cable is connected to a metal casing port in the gigabit switch at one end, and the other is connected to a metal cased adapter, which is then connected to whatever device you choose.

At this point you have Internet access using Ethernet to a mobile device or tablet, but the Ethernet gigabit switch is not grounded.  Here we move to the next step which is the grounding rod.

A grounding rod has a metal alligator clip at one end, which simply clicks between two metal cased ports in the multi-port gigabit switch - metal to metal.  The other end of the rod drops discreetly outside a nearby window and staked into the ground outside.

In summary that's how the setup is here, and to be honest, I only just looked now at the casing insdide the adapters and they are both metal, so I assume its OK.  On that basis the only question I would pose back to you, what is the casing material of your adapter.  If the answer is plastic, I can't say for sure........I would just a buy a new adapter😀

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