I do not know why all this nagging. The laws of physics can not be cut short and a stronger neodymium magnet would probably do the sensitive electronics of a smartphone in the long run not good.
If one smartphone on a flat surface and moves with the adapter in the vicinity of the loading pin, the magnet attracts the adapter already in the direction. He then holds firmly also relatively. Unless you buckled him for bottom or top of the smartphone away towards.
But people: Have you ever heard of the law of the lever?
Google it and you will realize that such a small magnet can not withstand such forces.
I would recommend him people who want to do something good for your Sony and protect it against water (because the seals are rather very delicate) and her cell phone sometimes "let alone" can.
I would recommend the adapter people who always have to play with your smartphone and it can not even keep charging 2 hours in peace.