I have had good luck displaying handguns on a 1/8 inch pegboard attached to studs with a spacer each place it was secured to the stud. Initially I used plastic nonmarring pegboard hooks but found{the hard way} that over time one fatiqued allowing a revolver to fall. I now use steel hooks that I dip in plastic/rubber tool handle coating. While you still need to be careful when you put a handgun on or off it does not mark or otherwise damage the handgun and they are easily rearranged as more are added or you need to adjust in any way. It also allows you to see and enjoy them. As to security , they are in a walk in vault as well as all the other normal security measures.