Hey Ulesys, a few options to consider.
However you might also want to consider that carrying camera gear can take you away from being in the DW zone & with 24ks for the kotc run, that's more than 2 to 3 plus hours of paddling & possibly/quite likely, having a few swims.
With that in mind probably a front mount on the board & maybe one shooting from the back, so it's all hopefully away from your body & your not concerned about the gear assuming you don't take it out accidently with a fall!