They won't open to 180ยบ. Mines out in a rainstorm right now and the only way I could figure out where it stops is to take off the gas struts.
Going to the point where the hinge stops would put stress on the fasteners. But you could make it stop anywhere during its arc with gas springs.

I don't think every hurricane hinge is the same. You might give one of the retailers a call and ask them.
Tony