2 words= Bungee Balls!!
On the P18, I keep a sturdy, medium-sized SUP paddle w/ a T -handle bungeed to the hiking straps, just behind my built-in tramp bag and just in front of my jib blocks. I lays flat, between the hulls and doesn't seem to snag anything there. So far.
I see others who bungee one right to their boom. As I often do with my gopro camera pole. This works better on a boxed boom than a rounded one. If you do it right, it won't jam up the outhaul or rotator-limiter systems. No one has been guillotined. So far..
Personally I see no point in strapping the paddle under the hull, where it will be out of reach in light winds, or following a rudder failure.
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Prindle 18
96734
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