Hello,
Unfortunately we have not done many of these to give you the best location. My suggestion would be to call Portland Pudgy and get the center to center measurement of their davit locations. Make sure they tell you the measurement of the front and back of the dinghy past each davit location as well. You should then be able to take that and measure it out on the boat. Make sure that when you mount the pudgy that you reinforce the underside of the platform with some metal plates.
Best regards,