How big is the sail? What are you trying to attach it with?
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I think that will work fine.. You might put some carabiners on the cirners so you can take it down if you know there is going to be some bad weather.
You could also look at the rafters and tie the one you are anchoring to to another one close.
I would recommend doing something like what I did in this photo. I originally just did a simple hook like you posted, but some very high winds bent it, and it was somewhat loose - I still don't know how it stayed in.
I cut a piece of angled steel, drilled holes, and painted with white Plastidip. Then used some nylon spacers with the marine hook. I have not had any issues at all, it's been 7 months and they're rock solid.
Looks nice!.. So do you have one of the bolts going through the rafter behind the fascia then?
Yeah. There are also 2x4s running parallel behind the fascia (which are attached to the rafters), so it's really sturdy and anchored.