point, but stiffness doesn't matter as much as choosing a place where the tie won't get in synergy with other stresses to cause damage.
The stiffness of the chine, and its contour, make it vulnerable to two kinds of damage, blows from outside and closure of the chine angle if the bottom of the hull is forced upward. For longevity of the chine, one might not want to have tie pads laid onto the inside of the chine. I have two composite boats with thin hulls, foam reinforcement of the bottom, and one with Spheretex ribs up the sides. I wouldn't put tie points on the chines of either one. I would prefer to put tie points up above the chines on the sides, or in one case to mount them on the bottom of the triple saddle.
As Mr. Guide pointed out, an ultralight canoe shouldn't see the sort of use that would make tie point location critical. But if one ever has to do serious repairs on an ultralight, it will be much easier if there aren't tie points epoxied to places like the foam core, the core margins, or the inside of the chines.
The Kayak Wing
Pull-Up Strap Handle Kit
4-place Boat Trailer
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