I used self-tapping screws (1/8" x 1/2" or so, maybe 5/8") in the wheel wells and in the door sills of mine because I envisioned having to take them off occasionally... which came in handy yesterday when I had to remove my fender.
If you're going the tape way, that Grey/red back 3m tape (which is labeled VHB right?) or the stuff that actually is labeled VHB is the best, because it won't vibrate loose if the side skirt is not flush with the door sill. It's the same stuff they use to hold the glass to the frame on the outsides of skyscrapers, so it's strong.
I like rivets myself, but don't like having to drill/re-rivet if I ever take them off. For using body filler/painting though, they're much more friendly that screws.
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