Hi and welcome to BYC!
It is always far better to either build your own or convert a shed , so you can walk in (to clean and gather eggs)
I started with a prefab coop-run and got a terrible backache from all the bending.
Now I have a small shed 8x6 with 12 ducks, they have 4 sq feet each, which is the suggested requirement , and they have a 3000 sq ft section of my yard with 6ft high fenced to run and play all day, and plenty of what I call "hawk obstacles" to hide under (childrens playhouses, picnic tables, chairs, bushes, small trees, etc etc)
The duck-house 'shed' was a childrens playhouse but its a big one I can stand up in and have my own 'adult' door , plus the kid's door for ducks. I had to get my tools out and cut into it 12 windows, 1 sq foot each for ventilation, as high up as possible. I attached hardware cloth inside and out and framed around them.