Why even worry about it? If you wheel, it gives you another way to get water under the Jeep to clean it.
Unless you have a 2"+ body lift, the gap disappears over time. If your Jeep is dark, it is hardly noticeable at all. I have a rear tire carrier on my bumper that hides the back gap and that works for me. As for the sides, meh, not worried enough about it to spend the $$ to get the gap guard.