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I know mine is a small plate, I just stuck it on using 3M tape.
However, when the car was at the dealer, the US size plate was mounted on a factory OEM backing plate. US models may not have those screw mounts on the grill like ours do so you may not be able to use that factory backing plate. I would've sent you mine out Free of Charge.
Here's a pic of the car at the dealer prior to purchase.