Magnetic shell is not strong, the shell will fall off when you turn over the car, not as practical as R buckle, if you want to say a better fixing method, I think it is to replace the larger specification, higher grade of strong magnets (such as higher grade N52, thicker strong magnets).
But note!!! It is only recommended to replace the front (or back) magnet, so that as long as the front can be opened, the back will open smoothly.
Then you can also hold the car shell to carry up at the same time also not separated, to achieve the desired effect. Don't replace the front and back with strong magnets! Otherwise the car shell may be difficult to open.