The angle and launching position does not really matter for this shot. Just launch and use power up.
Power Activation Point
Use the pulling power up to grab the pieces while in mid air.
First Shot Result
This shot should kill the two pigs shown in the picture.
This second shot is really tricky. Launch the laser gun pig with the angle shown in the picture.
Second Power Activation Point
Tap for the power. Note that your lasers have to bounce off the metal and all three lasers have to hit the metal to break it.
Second Shot Result
After both of the TNT bombs are triggered. They destroy enough blocks and you will earn the three star mastery rating.