Not sure if the petrol and diesel undertrays are different but I removed and refitted mine last night and it takes about 2 minutes, and thats on my own lying on my back. You are right about 10 holes: 4 at the front and as Klarzy says teh undertray lips over the front bottom edge of the bumper, 2 right at the back, 2 about 12" from the front and 2 somewhere else (these are missing on mine).
Good luck mate. It will be worth it when you get it on.
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