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Just thought I'd add my two pence worth to this discussion.
Ive got a tom tom regional V2 (very like the XL only smaller) and have an athermic windcreen on my Laguna. I havent had a problem getting a very good GPS signal. I dont even have to place my tom tom below the rear view mirror, I can put it where ever I like and it gets a signal.
Like truckbusuk said, try it first and see how you get on, I have a feeling it will be OK.
Currently in dave_mezza2006's garage:
2014 Vauxhall Astra Limited Edition 1.4 16v VVT Turbo