My vehicle has a bare roof. I’m needing cross bars for it. I plan to attach kayak racks to the crossbars once I have them. J-cradle I think the kayak haulers are called. I have 2 kayaks. A 10 ft and a 12 ft.
I have used Thule’s Hull-a-Port Pro (folding J racks) and their Hullavators. Both were made to fit Thule’s square bars but came with adapters for Aerobars. Just make sure that 1) the J racks you buy will fit the Aeroblade Edge bars (I think they will) and 2) that the width of bars will accommodate both kayaks.
Just a comment on the aerobars, the argument for them is noise reduction. I went to the less expensive square ones after the Yakima round bars, and find the noise level greatly more manageable even just with the squares. I should note that in the car I listen to classical music which has more dynamic variation than pop music. I do lose some of the really quiet parts, but for the most part it is OK. My biggest noise factor is not the square bars but the Two Hullivator units.
It may be that for your purposes, going to aerobars that include the feet is cheaper than going square. Depends on how much.
I moderated the noise of my square Thule bars by winding 1/8" braided accessory cord around them (72" long workboot shoelaces would work too.) Popped off the bar end caps and tucked the cord ends in before locking them in by replacing caps. I used black but may switch to neon green so I can find my generic charcoal grey station wagon in parking lots more easily. I miss the old-style radio antennae that you could fasten a flag or plastic flower to for parking lot ID. Yeah, I know I can just click the horn button on the electric key fob but I think it’s rude to startle people walking by honking at them.