Ok so I went to my car with the iottie to try it!
I took off the old holder which was sticked with a 3M plastic disk,the suction pad was far from enough on my Citroen DS3 textured dashboard.
Cleaned the surface where the iottie will take place.
Tried 2-3 times...oupss it doesn't stick!
Then I noticed 2mm of the sticky suction base was not on the dashboard because I wanted it as on the border as possible.
I replaced it 1cm on the dashboard now the whole surface was touching the surface, while pressing on the base I switched down the lever and it was a little hard to do it,meaning the suction was working this time,and WOW I was amazed!
The holder was super glues on the dashboard,it was like cemented!!!
Tried the one handed operation and it was fairly easy, taking it out is just pressing the lower arm with the M8 till the mechanism is fixed
I hope it will stay glued even with high temperatures as it can reach 38c in summer here.
The design is pleasant both from inside the car and outside,the black plastic looks like it was made for my car.
Here some photos taken with the M8 in low light: