Which model/year?
The 'bumper' attaches to the wing. Bumper: 2 screws beneath and in front of the front wheels - they go into the lower splash guard, 2 ? screws to the upper edge of the wheel arches is this the one you referred to?, 4? bolts just above the lower air vent [ lower grill], 2 or 4 small bolts across the top of the bonnet slam panel. I think that's it.
Front wing: a small hex bolt infant of the sill [it's low down], another higher up behind the upper door hinge, wheel splash guard off, Mudflap off too, 6? small hex bolts along the bonnet/wing line.