ebay 2018 gt350r wing need some help

[thecloneranger]

so i installed cheap ebay gt350r wing on my car. had it for over a week now and it shakes alittle when going down the highway. the holes that were predrilled into the spoiler i belive werent spaced out enough so i believe that i can drill some more holes on both sides to reinforce it better. but which screws do i use. like which screws would be best to drill straight into the spoiler from the trunk

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[thecloneranger]

id like to put 2 screws in the thin area of the trunk more towards the rear window but not sure what screws or bolts to buy any help will be appreciated