Why would this matter? your amp doesnt produce current on the outside of it so.... i dont understand if your asking if the screws would pop out or what.
I was just making sure, i just read somewhere that if your screws are, for instance, screwed into the back of a seat and screwed into metal, it could be touching ground or something and mess it up
there would only be a problem if you screw that was touching the ground or (thought metal) that would be if your power hits your ground, then the amp houseing its self would become live for a min. but that would be a huge problem i dont see happing