What is the correct way to place Chinese eight-ball masters?

The target ball is placed in a triangle, the ball with the top corner is placed on the "ball release point", the No.8 ball is located in the center of the triangle, and a full-color ball and a colored ball are placed at both ends of the triangle bottom respectively. Other target balls are randomly placed, but they must be close to each other.

The target ball and main ball of 1 to 15 are used in Chinese billiards competition. If one player chooses to play 1 to No.7 target balls (full color balls), another player must play No.9 to 15 target balls (color balls). Players first hit all the target balls of their own colors into the bag, and then hit the No.8 ball into the bag to win the game.