I have always read that with mountain pedals, the raised rubber of the sole (the part underneath the blue arrow in the photo below) is an integral part of the shoe-pedal interface. This shoe has a completely flat sole, therefore it won't be stable on the pedal, even if it does take a two hole cleat.
That is my experience as well. The sides of the sole on either side of the sunken in SPD cleat, should contact the pedal when you put weight on it. If your entire weight is supported only by the SPD cleat, you will develop hot spot.