Ok, this isnt exactly a woodworking question but this crowd would probably know this sort of thing. I am on the board of my condo complex and we want to put up 4" house numbers on the front and back of the units. In front there is vinyl siding. What would I secure plastic or aluminum numbers to the siding with? I dont want screws to rust and leave streaks on the siding and dont want to crease the siding either.