It's easy actually.
Take a section of the trim off and you will see how the underside is shaped, and the go to the hardware store and get some flat head machine screws that when two flats are ground on the side of the head will slide into the trim.
The flats keep the screw from spinning when you tighten them up.
Been there and done that is why I know for sure this works, and don't forget to seal around the attaching screws to keep water out of your trunk.
This style works perfect and can be gotten at Ace Hardware in the furniture hardware bolt and screw boxes they have on the wall.
You can also use flat head screws like go into a tapered recess, but they have to be the exact right size and not tightened too much as to spread the trim.
Actually you just want any of them just snug and not over tightened where it distorts the trim.
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