Sorry just saw it.
Usually there is one spot aligning with the tail light spoiler (easy to find) will only fit there mark that with the tape and stick it with silicone. We prefer not to use 3m tapes that much, as it increase an odd gap between part and body.
When installing it on sport trunk it lines with the holes so i think maybe that causing some issue in yours. Mainly we are not molding it. Adding some screws after silicone can give added strength.
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