This is how I tie down my canoes.
I use 1.5" flat webbing looped and folded with a hole through them, and sandwiched with the inner fender bolt through it. works great. You can buy hood tie downs with grommets through them. When your not using them for tiedowns, you can tuck the webbing underneath the hood.
The bow tiedowns are 5mm climbing rope, looped through each of the boats painters and each tied with a trucker's hitch, and a backup knot for the tag end. With my Yakima rack, I would probably be alright without bow tiedowns, but being that any long load has the tendancy to catch wind, I always tie the bow. Cracked carbon fiber is a PITA to fix.
My bars are 78" wide and have plenty of width for 2 solo canoes. I use gunwale brackets and 12' NRS straps to hold the boats to the bars. The towers are the now discontinued Yakima X-tower that I got off of a buddy that traded in his older Xterra. Yakima DOES NOT RECOMMEND using these, because they were discontinued before the '05+ came out and they never had a chance to test them out. Anyway.
For stern anchor points, which as many have pointed out, we have none, I used
. I drilled 2 holes on the edges of the bumper. They are totally out of sight, not in the way at all and very useful for tying down longer loads on the roof.
Fishing rod rack/paddle holder. Lifevests and kneeling pads go underneath shelf.