Presently I crab out of an Ocean Kayak Trident Ultra 4.3.  The well behind the seat is about 6” deep with true vertical sides.  I toss my crabs in there and do not worry that they might escape.  Can the same be done in the well of Hobie kayaks?  They seem shallower.

I put my crab in the front bow hold because, well, I have a furry monster that always calls 'dibs' on the back of our Outback.  lol

Actually, I made a quick cardboard fence (covered in duct tape) that goes across the inner hull at the vertical post just in front of the drive well, keeps the crab from scooting by.  I tend my pots on the bow from a kneeling position, then just lift the bow lid and pot up a bit, slide keeper crab into the bow, plenty of space for a dozen up there.