I made simple brackets out of aluminum barstock that fasten to the inside of my engine door louvers, so for future aesthetics, there are no visible holes. I used brass screws, washers, and nuts as they look better to me against the plaques, and the softer metal stays snug with less risk to the plaques from overtightening, but stainless would work. Either fastener will resist corrosion. Aluminum rivets do the fastening to the backside of the louvers. If your coach doesn't have such louvers, this may not be an option.