I took a $14 foam yoga block I bought on Amazon and cut it down to fit snug in the dash tray. Inserted magnetic strips on the face and attached thin magnetic plates to the back of a fire tablet 10 that is Alexa enabled and audio routed to my stereo’s bluetooth. Speed bumps and railroad tracks, it didn’t budge. Working with a friend to 3D print me some. But the foam is great to keep the tablet from overheating.