It can work, but a 3-inch offset is not ideal and will likely cause tension and alignment issues unless you extend the receiving post so both ends align straight when the screen is deployed.
Yes — you can install the screen using a post on the latch side, but the main cassette must be fixed to a solid wall or rigid post. You cannot use posts for both sides independently.
Has this ever installed upside down to us as a sun shade on a balcony? Installed on the ceiling of the balcony opening & push the handle up rather than down. How wide arms mounting accessories?
The product body needs to be installed by drilling holes on the wall and the support pole columns need to be installed by drilling holes on the ground.