The very good feature of the camera we are using in this project is that it keeps track of every single point it sees (up to 4) as long as they stay on screen.For the setup I prefer to put the leds right in the middle of each side. Makes it perfect to know which side you are aiming, and reduce the view angle needed by almost halfActually I just managed to make the Arduino able to recognize which point is which, with 3 or 4 points on screen.Once those 3/4 points get detected, it keeps track of them, and you can aim anywhere as long as you keep at least one point in the cam viewing angle.Of course the more points the camera gets at the same time, the more precise the aim and tilt will become.You can even move around or get closerOh and if you put the LEDs right next to the LCD panel, or just do one calibration (to detect the screen borders) , you won't need any more calibration for a perfect sight aiming