Hi Katie,
My best suggestion would be to search YouTube.
https://m.youtube.com/watch?v=4892hcQ2bzg
I am not sure I am crazy about this guys zip tie method (drilling holes in to the car is not for me) but I am sure it will hold the strips.
While I agree with the build it for yourself / screw the haters the led underglow thing is generally out of style. Then again there are people running insane camber and riding on 2" of the inside tread on their tire. So what's in style or out doesn't necessarily dictate good taste.