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take off the license plate then screw the holder on with the plate.
Yes
on the bumper?
Yes you can!
yes but it do not need to be there
yes
If you're asking about where to put your sticker on the license plate than that would be the rear plate.
Probably
If it comes with a plate mount it will be under the rear of the seat or by the back mudguard (if equipped).
You put a sign in the license bracket "in transit"
the top right corner
no !