Running a plate in the window is illegal, I know it looks better, but it is an offence, plain and simple.
Your plate is there for recognition of ANPR machines, dotted around everywhere. If it is in your front windscreen then it may not be picked up by the readers due to the glare from the windscreen, and if your car is stolen, then police won't be able to track it.
Everyone on here prefers the smooth grille, but the law is the law, run the plate with suckers on as I did for years, and then when you want to take a photo, just pull the plate off and then restick it moments later, you won't be seeing that the front doesn't look as good when in the car anyway.