naf,
The spoiler I had fitted is placed so that the support leg sits at the extreme edge, just before the boot curves down......(you dont the leg hanging over)..
I should think you could mount it forward from that point without any problem as long as you have no problem with the underlip of the boot for bolting purposes.
The support leg measures, as best I can tell, 150mm from leading edge to trailing edge........NOTE that the bolts, which I would assume are moulded to the spoiler, are offset towards the rear of the leg.
Wth a spacing of 75mm between the two (centres) the rearmost bolt appears to be only 15mm from the trailing edge of the leg
/______________/
............... !.............!
l...60mm...l...75mm.l..l15mm
like so.....
Hope this helps...Rogues