Those racks look nice, neat, and tidy. But I like having the load lower if possible, and closer to the front.
I have the Yamaha rack and like the way at its front it attaches to the muffler support/hanger on the right, and to where the helmet lock attaches on the left. That makes the rack's front attachment points much further forward than most of the others racks I've seen.
However, the top of the Yamaha rack is not good. I leave the silly thin top plate off, and then the 2 hooks at the back of the Coyote bag attach nicely to the front of the rack. Then I use the rack's 4 load attachment points to pass through 2 nylon straps (do NOT use bungy cords on anything except smoooooth roads) that then cross over the kayak bag, and then cinch the straps very tight.
This setup, along with the Cayote bag's external load-tightening straps, makes a very, very secure load. However, access to stuff in the load during a ride is NOT quick and easy.
That's all IMHO. Maybe I worry too much about a high heavy far-back load, but some times I need to carry a few beer too. I'd hate to lose/damage that cargo.