One is via a spike through the gutter and into the fascia.
Guttering shed overhang.
Your shed porch or overhang.
Is it possible to buy brackets that extend to account for the overhang.
Another is a hidden hanger that hooks inside the gutter and is also nailed through the face.
The rainsaver is a proprietary brand that is just one of many similar types of clamp on guttering designed specifically for sheds.
For rainy climates where gutters will handle a larger amount of water for long periods they should have a maximum distance of 18 inches apart between them.
The idea behind the rainsaver brand is that it is ultra easy to install and cheap.
This type of guttering for sheds is pvc so it is quite durable.
Now you can collect the rainwater e g.
The last would be a roof hanger that is nailed to the roof surface under the shingle tab.
The attachment is one of several methods.
For structures like garden sheds easy to cut and snap in place pvc guttering is an ideal choice.
Attaching a gutter and downspout system to your shed can prevent muddy ground around its base and prevent its walls from rotting prematurely.
Your shed summer house porch overhang or other small building with a sloping shed roof only requires guttering on the lowest roof edge.
Have just asked my hubby as he had to do this with ours you need to screw a batten on to the shed to fix brackets on for the guttering and no to the second part of the question hope this helps.
Guttering for one roof edge only for e g.