Hi Tiago
Yes that would be frustrating. Our Thermomats are the French manufactured 9-layer units and also use suction cups.
In my experience they work well so long as i have moistened the cups reasonably well first, and the applied to a reasonably clean interior window surface.
These French ones in my experience seem to be perfectly fitted to all 8 window apertures so I have not suffered from any type of ill-fitment causing it to dislodge.
There is a difference for the large front window mat for T5 and T6 so important to have that right (T6 interior rear view mirror housing is larger, so the Thermomat cut out is larger - see T5 and T6 below)
T5 mirror surround
And T6 mirror surround
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