you can NOT mess up this install. its the simplest thing EVER.
you remove the 5 screws on the bottom of your factory bumper, and fit this plate in and re-install the 5 screws on the bottom of the plate & bumper while a friend holds the plate.
THEN you get a small and I mean SMALL drill bit and predrill a hole, through the plates existing MOUNTING holes, into the black portion of your bumper. then install 8mm black screws available from BMW. ANY 8mm screw will do. AND if you want to be super careful, you CAN just buy some smalll rubber washers and put them between the screw and plate.
I've got mine mounted with no rubber washers and mine has never moved.

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S