Many people have used the Velcro ( the kind used for EZPass toll on windshield ) without any issues.
Anyway, I refuse to put a front plate on and just today I had two police officers standing outside at a stop light checking out my ride and pointing at my front spoiler lip and giving me a thumbs up. 20+ years with no front plate in NJ with never having a ticket. If I eventually get one, I'll pay it and go on with my life.