Decorative corner posts are generally located on the corners of homes and chimneys, unless it is a brick home. If you have a home with wooden siding or fiber cement siding, you already have corner posts with a 1-inch by 4-inch or 1-inch by 6-inch trim. If you are having vinyl siding installed to your home, then vinyl outside corner posts are the best choice because they come in matching siding colors and trims.