I’ve never noticed stickers under the numberplate, I guess they’re not as popular where I live. Most stickers I see on cars are on the windows. The few cars I’ve seen with stickers on the body of the car itself were owned by teens and more often than not looking like a piece of worthless junk on wheels. It might be a cultural thing, I take OP’s image relates mostly to America.
I’ve never noticed stickers under the numberplate, I guess they’re not as popular where I live. Most stickers I see on cars are on the windows. The few cars I’ve seen with stickers on the body of the car itself were owned by teens and more often than not looking like a piece of worthless junk on wheels. It might be a cultural thing, I take OP’s image relates mostly to America.