RAM components are the gold standard IMO. But no matter what you use, or if you drill or bolt in, the more attachment points you have to secure the tablet, the better. People will claim they can mount an iPad from their A/C vent and it's "solid".
Multiple attachment points help reduce the lateral and vertical movement that happens when you hang weight off of a fixed point, and then put that weight in motion. Here is my tablet setup in my vehicle, three attachment points and the tablet truly is an immoveable object in my car...
https://www.overlandbound.com/forums/threads/creating-a-tablet-mount-for-100-series-land-cruiser.16207/