Here are measurements:

-from boot side to spoiler side leg 58mm
-from boot front (rear window side) to spoiler side leg rear side (rear window side) 520mm
-from boot side bend/shape to spoiler side leg 15mm

Spoiler rear side is easiest to adjust using slot between black part of spoiler (locates at the back of spoiler) and colored side (spoiler can be also fully colored in the very latest models, but there is still this same slot, what can be used)
So take some straight stick or short ruler. Place it against boot rear side, where you have boot lock. Locate this stick/ruler about 80mm from side of boot (measured from the top of rear, if you take measurement from bottom of rear, it`s incorrect) direction to center of boot (idea is at stick/ruler is about middle of spoiler side leg).
Place spoiler on boot and move it so at this stick/ruler just touch this spoiler painted part. This spoiler slot and black part stays outside from stick/ruler.
There you have original place for spoiler.

If you need more measurements, I`m will help with pleasure.