Not in France nor a CX owner but my Plus 4 has (I assume) a similar screen.
The tag only works when you hold it over the screen if the roof is down or out of the window when it rains.
I have had the tag for some time & find it saves a lot of time on the busy auturoutes.
Same for me.
I've used a tag for maybe 15 years or so and in both Morgans (Roadster and +8) the tag doesn't work very well through the windscreen. So I keep it in the side pocket and hold it over the screen or out of the window.
I assume this is because there's not a heating element free space as there is with most cars behind the rear-view mirror.
