A gutter cover or gutter heating system might be just what you need for your metal roof.
How to install gutters on a metal roof.
Either way the gutter brackets should clip around the top of the half round gutter length to hold it securely in place.
If you don t want to remember to clean your gutters or you don t find balancing on a ladder to be a safe fun way to spend your weekend you can install a gutter cover.
For self assembly the easiest way is to use a suspended type of structure which provides for fastening the gutter to special hooks located along the eaves.
Crimp one end of the short length of downspout with a special sheet metal crimper.
Crimp three times across both long edges and twice on the narrow sides.