Iirc the height adjustment threading can be spoiled/locked so it's impossible to go below 100mm, then mod plate issued. Most people wouldn't dare to spoil their expensive coilovers though so no one does it. I've been driving with bcs for 4 years now, only got pulled up once and the dude just said it's too low and drove off, mind you this is in an s15 that was slammed to kingdom come lol. My current caris much mmore sensibly set up and no attention attracted so far. If you don't plan to slam it then good chance they won't care, but it's your choice in the end.
Edit: left out an important detail never been through a roadside defect station ever. If you got stopped at one then that would be a different ballgame...