I first bought dakine aero rack pad for factory rail, but then swapped them out for rhino rack pad because almost fit entire length of factory crossbar. I use thule express strap for in town , then will uses rhino or dakine strap for longer road trips. I just wanted easiest n quickest strap. The express strap allows me to easily remove when not using. Im pretty sure i can get longy n shorty side by side on factory rail.
I dont use for sup. I just use as basic padded rack for mainly surfing and anything else i can fit up there. No bikes, sup or canoe attachments for me. Ladders, snowboards, lumber, etc, work great with straps.