Heat reflective glass or not

Hi all I am about to go to France and I am thinking of getting a Liber-T-Tag but I am not sure if it will get the signal out of the glass, My X Type 03 2.5 has heated front screen but not sure if it has heat reflective glass as the signal will not go through if it has.

This is the reply I got from Sanef tolling

 The mottled / shaded area behind the rear view mirror will be free of elements and any heat reflective coating.  The tag should go in that area so the signal to it is not blocked by the elements in the glass or heat reflective coating on the glass.

As you have no mottled / shaded area behind the rear view mirror you need to ask your vehicle manufacturer if you have a heat reflective screen fitted or not. 

If you have no heat reflective screen you can position the Liber-t tag on to clear glass.

Thanks in advance Dell