Basically the coupe and the sedan look the same in the front. I was going to put them on the outside of the center(Picture with yellow markers) but they are saying to put them in the center(picture with red markers)?
I live in arizona so I have no front plate and will never need a front plate.
One thing the E90 sedan has slightly bigger headlights than the coupe. I will try and attach a good picture of what my front looks like. (not my actual car pictured my BMW is in the shop)
^picture of sedan front. Remember I dont have a front plate.