Although I haven't yet removed the mudflaps, or bought Shrockworks sliders, with less than 1000 km on my X there were a couple of small chips.
What I did was to buy three packages of clear Ricochet Lens Protector
from a local auto parts store(Lordco). The distance from the bottom edge of the X's side trim to the bottom edge of the doors is about 5.5 inches, and the Lens Protector comes in 10x16 inch pieces. Mine had two sheets per package. By cutting the sheets lengthwise I had six 5x16 inch strips, which is enough to do both sides of the X, between the back edge of the front fender well and the front edge of the factory protective film at the front edge of the rear fender well.
The Lens Protector has only been on a short while, so I can't really comment on how good a solution it is. I placed mine up against the bottom edge of the X's side trim - this leaves an uncovered gap along the bottom edge of the doors and top edge of the rocker panels, but that's the least likely area to get chips. I used a plastic autobody filler scraper to smooth the film into place. The second side looks better than the first, because I had learned to 'go slow' and pay closer attention to air bubbles.
To deal with the curves where the film meets the existing factory film, front fender, and between body panels, I cut a 5 inch wide strip of paper from an 8.5x11 sheet of paper, held it in place, and traced the curve. Once this template's curve was cut, test fit, and adjusted, then I used it to draw the cutline onto the film(black ballpoint pen worked fine), then cut the film.
The only issue was that after heating the film with a hair dryer and using the plastic scraper to apply it, the film stretched slightly, so I would apply most of the strip of film, trim off the excess backing material so the remaining part could lie flat against the body, overlay the template, mark and cut the film, then peel off the remaining backing and apply the final bit of the film.
One other tip - once you have cut one 10x16 inch sheet in half, make sure both halves are the same width, and if not, use the narrower one as a template to trim the wider one, then use that narrower strip as a template to cut all the remaining "5-inch" strips. That way when two strips but together the join will look better.