I was wondering about the fitment as well.
If you look at Tony_fin's post (via ma9mwah) here -
http://seatcupra.net/forums/showpost.php?p=4365399&postcount=20 you can see that there's a teeny bit of original spoiler visible. Helps that in that pic the spoiler's not painted so it's obvious where spoiler finishes and car begins.
So it must be right, probably because as Sweetfr says, any further forward and it would snag on the body when you open the boot.
In some ways its a pity SEAT didn't make it as a replacement for the existing spoiler - i.e. remove the current one and fit this new nicer one. But on the other hand you've only got to look at the price of the front bumper to know what that would have meant
From the pictures you can only really see it in the closeup shots, in all the other slightly-further-away shots it's nowhere near as obvious. Plus when driving past people you'll be moving quickly too
I'm pretty obsessive about things fitting properly, but the more I look at the far-away shots the more I think it looks quite nice