So finally got around to posting some (cellphone) pictures. I got the Kerscher 1M lip from Stu @ BMR, great guy, awesome service.
The instructions were in German but luckily there was a picture. There are a total of 15 screws to mount the lip to the car. 13 need to be drilled and the other 2 use existing screw holes. I didn't want to drill that many holes so I ended up drilling 5 holes where it counts and used 3M exterior tape for the rest of the lip.
See pic below:
Green - drilled
Blue - existing
Red - tape
I removed the bumper to make mounting the screw/nut easier but maybe it can be done without removing it. Just followed existing guides on this forum for 1 series with the exception of 1 extra screw on the 1M bumper which was a PITA to get to (had to remove fender liner). See arrow below
Here's the finished product, excuse the lame quality
The front is not a lot lower but because it sticks out more, it can scrap on gradient declines in car parks. Not sure how drivable it will be once its lowered.