I have a tomtom Rider satnav. On my bike it sits on the handel bars in a position not to obscure the clocks in my car I have it on a bean bag resting on the facia panel.
The reason for this question is I see a lot of drivers with the sat nav stuck in the middle of the screen just below the mirror, in fact the prompt for this post was actually following a woman this morning who had the satnav half way between the center of her steering wheel and her mirror one of the tomtom XL screen at her eye level almost in her direct line of sight
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To have one suck in you normal line of vision must be dangerous most modern cars have far too many blind spots why make it worse. I know in the USA many states do not allow anything stuck to the windscreen within the arc of the wipers, personally I think this is a good idea.