Suggestions for Contact Sensor placement

Our home builder liked to go crazy with weird door trim designs and unfortunately, all of our exterior doors have this thin, bullnose shaped trip, that does not allow flush mounting of either part of the sensor. Do the sensors have to be mounted flush with each other or can they be at an angle, as long as they are within the required distance from each other? I am sure that someone has faced this before me, so any suggestions will be greatly appreciated... Thanks, Mike