I looked at the link, and that's great if the material you're using is flexible enough to tuck in through the holes, but won't work if you use a stiffer material, like the aluminum gutter guard from home depot.
Even so, there's no need to remove the entire front end. You can just temporarily remove the locking plastic pins that secure the lower center section of the bumper, allowing it to swing forward. That gives plenty of room to slide the grille guard in through the opening from the bottom. They're easy to spot from underneath. If you want to practice releasing and locking them without crawling underneath the front end of the vehicle, the plastic cover over the radiator under the hood uses the same type of locking pins.
Secure the zip ties as close as possible to the top, bottom, and center of the vertical grille slats, and the zip ties will become pretty much invisible once you snip the excess off. I have to get really close to mine (down on my hands and knees up close) to see the zip ties.