But you did see plants, where metallic framework is connected to earth potential at several points? Ground mesh or grid does not mean 'ground plane'. It describes the methode of having connected metallic framework at as many points to earth potential as possible. The more the better.
nope, never. Here it a wire to grounf from each unit.

Here in Germany, where industrial environment must obey CE standards, a whole industry is growing, helping to transform plant into high frequency suited environment
The CE standards do not apply in the US (un)fortunately.

Erik