Aluminum Universal Magnetic Mount(Rectangular)

Q1:can this be use with a case or do you have to connect the magnet directly with the phone, also do this work with the iPhone 6s plus

      Yes, you can use it with a case, you can attach the transparent sticker to your phone frist to avoid the spot,you can place the two plates on each side of the phone case respectively, which will make the magnet stronger and the plate wider.