I'll get a photo of mine later and post it. I hang it, one of the main purposes being to keep the load off your floor. I hang it with 3 straps off the frame cross bar (really only need 2), one to the inside stern rear d ring, then one each to the dring on the outside slanty portion of the stern. I like them attached to the outside d rings, so I can get to the buckle if it needs adjusting throughout the trip.
I have a lot of holes in mine, with small diameter rope through it, for multiple lash points. That way I can tie everything directly on it, to it. I do one more layer of gear on top and then it all gets a net over it. I like tying things down on top of it, because if the gear is just tied to it the board can actually lift in a flip and that would probably make it easy to tear off and have some serious carnage.
I am a river, babe - I've got plenty of time, I don't know where I'm going, I'm just following the lines..... - "We are water" by Shaye