I have a stock ride height but have still managed to scrape the front spoiler a few times:
So on with skid guards. I went with ones from Sliplo as the material was more of a smooth plastic. I read some posts on people that used the ones from Acexxon and they felt they were more of a rubber material so ended up gripping the ground when scraping and getting pulled off.
After installing using some 3M adhesion promoter, they seem to be stuck on very solid. I mis-aligned one when I was installing and could not peel it off with my fingers, I had to pry it off with a screwdriver.