Spent a few minutes poking around underneath. The only 'tricky' part I've stumbled upon is the center 'inner' mounting point is a hard plug. Not only is this covered over with the protective wax /undercoating (matching vehicle color) it appears affixed with some sort of thick adhesive layer, seems like only way to remove is to cut/drill it out.
The barely understandable instructions have you instead use the plastic card, similar to so:
I was able to make use of the installed rubber plugs (minus the aforementioned plug) and the smallest dab of sealant.
I have yet to tackle the routing of the wiring. I am less concerned about e-box / ecu placement than I am with getting the steps aligned and more secured (tacking those damn hard frame plugs!)
Some recommendations for any others who get the same steps, hardware and instructions.
-Sort out the included L-Bolts/studs and look for those with a slight angle. Found that those with >90Deg seemed to slip in place a bit easier.
--If on the other hand, all your hardware is perfectly aligned, get out a file and shave off the top of the short flat end (ie, the outer 'corner). This edge/corner/elbow will catch on the smaller 50mm holes. Filing these down just a hair opposite the weld, will allow them to easily slip into the orifice.
As mentioned in the YT video and shown previously (TYVM!), you will need to ever so slightly trim the plastic underbody panel.
This is held on with about half a dozen plastic push rivets
AND two Torx T25 bolts on the front/leading edge, where the wheel well meets the rocker.
I recommend getting some cardboard, make a mock up of the IG plastic guard needing "Adjustment", or use a straight edge and approximate where need to cut based on comparison of install points.
Myself, I found it easiest for me, to cut exactly a width of the mount/arm, right up until the pre-dilled holes. Then make a slightly wider cut making a "Y".
The narrow (stem) accounts for the arm width, however the wider opening is needed so the bracket does not interfere with the plastic guard when pressed fully back onto the IG.
Edit: <Potatoe Pictures of install coming soon>
Still working on alignment and electrical routing