Are the magnet wallet cases recommended for the iphone 6s plus?

I am currently browsing for a new iPhone case, i came across a very nice leather wallet type with magnet on the part that actually holds the iphone and at the same time detaches from the wallet it self. Not sure how to describe it maybe you all know it already, one brand that carries it is Amovo. Well my question is, would the magnet affect the phone since it will be seating on a magnet the whole time?