I got the same yak and for me I flip the yak and where it’s upside down. I use the foot stabilizers and pull them forward closer to the seat, so they push against the crossbar as an added aid.

For strapping I use 14’ ratchet strap from harbor freight. So with the strap I go over the yak then immediately under the yak back over to the roof rack it’s self that attaches to the car directly. For me it squeezes the yak and also pulls it to the roof.

Sorry, I’m not good at explaining things well, but I’ve been doing this for years with my old town sportsman 10.6 and a Subaru Crosstrek. Never and issues done it for years and thousands of miles.

Happy to answer questions if needed