K.I.S.S.
Keep it simple stupid.
No cutting.
No drilling.
No bending.
No buying hardware.
No "pushing" steering lines.
No added weight.
The Specs

Winston picked an aeronautical grade spec aluminum tha tis further reinforced with rear bends and L-brackets.

The skidplate is available in a Gloss or Matte durable coating.

The design integrates OEM style vents and rubber stripe for cooling purposes to the radiator and oil cooler.

The skidplate is lighter than OEM, coming in at 3.7 lbs versus 3.9 lbs for the Genuine BMW plastic pieces.

Zinc plated bolts, nuts and washers are included.

The undertray was tested on the popular GT4 lips and my GTS lip with chassis mounted brackets. It clears.
Winston is an aerospace engineer by trade and fellow E92 M3 owner.
Beyond that, he's a cool dude who does the right thing.