Advice for spoiler install?

Xplicit97

I have the Stillen rear spoiler, which I love. Its simple and clean, what I don't like is how it attaches, or rather how I was told it was suppose to. Currently it is held on by 3M double sided tape, and it doesn't sit or look right. Its been on this way for about a year but I want a better soloution. It is really bothering me, the tape actually is somewhat visible. Is there any kind of adhesive that is safe for paint that anyone knows about? Like a caulking or anything like that. There are no mounting points on the spoiler itself, and I have a base model spoilerless hatch. Any advice would be greatly appreciated. Thanks guys

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[B]2011 Brilliant Silver Nismo 370Z # 0305, 15 Nismo wide body conversion, Motordyne E370/Art pipes, Stillen G3, Airlift suspension,20X10 /20X12 Avant Garde F111 forged wheels