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Hi Tasdrouille,
The golf ball thing does not apply here. Unless one puts a clear dimpled cover off the back of the mirror.
That shape of vortex generator creates two vortices on ether side of ridge. The vortex will try to hold shape, but is eventually effected by the vacum behind the mirror. The vortex stretches out behind the mirror creating a flow envelope (not considering the spinning) similar to a boat tail shape. This is because the air has momentum. Once one sets it spinning, it takes time for it to slow down the spinning and go straight again. While the air is spinning, its not tumbling.
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