Any property owner desiring to utilize the procedures provided by this Division shall obtain from the Director approval for signs which shall be posted on said owner's property, pursuant to 26-142.03 of the section. Before erecting said sign or signs, a property owner shall execute an indemnification and save- harmless agreement which shall provide that the property owner shall indemnify and save harmless the County against any claim of damage resulting from the towing and impoundment of vehicles removed from said private property pursuant to this Division. Any signs, permits or stickers or other method indicating authorized parking on posted property must be approved by the Director as to design, size and content. Any property owner or management company that fails to comply with this section shall be subject to a fine of $250 for the first offense and $500 for any subsequent offense.