>>11489507
One piece of fishing line. Test line rated for 10lb will be plenty and will be hard to see.

Tie a slip loop onto each end and tighten the loop onto the upper wing tips.
have the mid-point of the resulting arc of fishing line go under the tail. Pull up the two arcs from either side of the wing and tail and overlap then secure to a thumbtack or ceiling hook

You now have 3 points of contact that will allow you to adjust how level it is in pitch or roll.