Get yourself some lashing straps like these. I think I got the 8-pack quite a while back. Then, as the other comment mentions, there are 4 tie-down points in the back. You will find having straps like that is very useful for many things.
I've got a tip for you on the NCG thing. My BiL and I prefer to go to the Marietta one due to cost and how close it is. We both have bigger upper bodies and so end up laying down because of those seats.
After a few experiments, we ended up getting these. We get there early enough and then just wrap them around the base of the armrests, behind the seat. Then we just tighten them to how far back we want the seat to go. It's made going there 10x better.
Hey there , we got our first kayak this last summer as well. We got a 16 foot tandem kayak and had the same questions about proper tie downs , this is what we wound up getting off amazon and they have worked wonderfully
Cartman 1" x 12' Lashing Straps up to 600lbs, 6pk in Carry Bag https://www.amazon.com/dp/B017902W8G/ref=cm_sw_r_cp_apip_YUI3PmW6vJdTX
They come in a 6 pack and have a nice bag to keep them all organized when you’re not carrying your kayak .
Also this video I found pretty informative on how to tie down your kayak . It had a neat trick to double secure your tie downs in case they fail
Anyways , help some of this info helps.
Cam straps. Get some off Amazon.
Are you talking about something like this? https://www.amazon.com/CARTMAN-Lashing-Straps-600lbs-Carry/dp/B017902W8G/ref=sr_1_7?dchild=1&keywords=tie+down+straps&qid=1605214520&sr=8-7
Get something like this, with good medal fasteners. You will get things much tighter than some rope.
https://www.amazon.com/CARTMAN-Lashing-Straps-600lbs-Carry/dp/B017902W8G/
Yeah, in that case, I guess one of the chapest options would be latching straps such as these