This photo shows how easy it is to attach 2 W500 fishing kayaks on top of a car:
There’s no need for special kayak racks, or any other accessory. The straps hold the kayaks together, as well as to the car rack, and they prevent the kayaks from going back and forth.
For extra safety, we recommend using more than 2 straps, because stuff happens.
Also, remember it’s better to avoid strapping kayaks and canoes in direct contact with metals bars, since these can heat on hot, sunny days, and the combination of heat and pressure isn’t good for plastic.
You can insulate metal bars using rubber, foam, cardboard, and even a blanket could do.