What is an alternate cr centering technique for an ap shoulder projection on an obese patient if unable to palpate the coracoid process?

This projection and method of shoulder joint in used to show proximal humerus, the scapulohumeral joint, the lateral protion of the coracoid process, and the AC articulaition, the insertion site of the subscapular tendon on lesser tubercle and point of insertion of teres minor tendon on greater tubercle, humerus is in external rotation and IR is placed against neck head is turn away, medial angulation of 15-30 degrees depending on degree of abduction.