Review on Non-Slip Cell Phone Dash Mat: Anti-Slide 📱 Sticky Pad for Car Dashboard - 4 PCS Black by Allan Lambert

I think it works. I bought them to mount my phone on the dash and listen to audiobooks in the car (I don't have Bluetooth). While it works, I was amazed that it doesn't even seem to stick to the dash, but sticks to the phone until I pull it off. I think I thought it was the other way around. And the question is, should the bulge side be attached to the surface of my phone or to the dashboard?