rulie
Head Pro
But the Local Rule does outline what to do if the ball won't stay on the mat and it seems very straight-forward.There is no mention of how he mat is to be placed in the local rule to keep the ball on it.
I believe that is on purpose as there are many different varities of mat and it would be impossible for the local rule to cover them all.
"If a ball when placed rolls off the mat, the player must try to place it a second time. If the ball again does not stay on the mat, the mat must be moved to the nearest spot, not nearer the hole, where the ball will come to rest on the mat when placed."