r/Earthing

I got a small mat last month for my desk, this one from Grounding Essentials. I picked it over a carbon mat because so many of the carbon ones in Amazon have reviews saying they start peeling.

It's under my bare feet. But my office is cold and I have sock on by lunch, so I thought about putting it on the desk under my forearms instead. Does it matter what part of the body touches it? I checked it with a multimeter and got a reading.