I have had my magic for a while now and I love it..I have a os 46 fx with a 12x4 APC prop on it. I have no off set on the engine mount what so ever...It doesnt need it. Mount it straight ... I have a blast with mine doing tail touches, torque rolls, blenders, hovering to a landing and much more. BE CAREFUL on those harriers though,,, It can get wobbly quick...
you can see a pic of my magic in my photos...

Good Luck