Lightning is a massive natural phenomenon that is unpredictable and challenging to totally protect against. It is poorly understood. Homes are rarely hit by lightning. When this does happen, the lightning usually takes the path of least resistance to the ground, such as large conductive systems like the plumbing pipes, electrical wiring network, or telephone and cable TV lines, all of which are directly grounded to the Earth.
Whilst it is unlikely that you will be hit by lightning you should follow standard lightning safety guidelines and disconnect your Earthing device and don’t use it during lightning and thunderstorms.