You've got me lost on this one!
Earth mats for ESD protection,as well as wrist straps are commonly connected to Mains Earth via a large value resistor (1MegOhm or more).
Even if the Earth connection was somehow elevated to Mains Active voltages,insufficient current would flow to harm you.
What I don't like much is the connection of such an Earth lead via a normal mains plug where the lead could contact one of the other pins.
Proper plugs are available--though,again you will be protected by the series resistor.
Never leave this resistor out!Radios have been earthed to the Mains Earth for many decades with a vanishingly small risk.
What are the "proper ways"?---It seems like you are the only one in the parade marching in step!
![Grin ;D](https://www.eevblog.com/forum/Smileys/default/grin.gif)