An assembly and a method for affixing an assembly to a structure. The assembly includes a bracket and an accessory. The bracket includes two or more bracket retainers and a bracket lock extending into an opening formed in the bracket. The accessory includes two or more accessory retainers, and an accessory lock. The two or more accessory retainers define receiving features, which accept the two or more bracket retainers when the accessory is in an engaged position with the bracket. The accessory has a sliding engagement with the bracket, from the engaged position to a locked position, in which the bracket lock engages with the accessory lock.