This is a bit of a "thing" with me. I rarely see new boats with anything other than gravity and/or friction holding down the sole or various access boards to the bilges. You do NOT need a rollover to have these boards come loose, particularly given the tendency in some modern designs of the hull
to flex and "oilcan". So you have two choices, I think: a means to lash boxes of provisions or spares to hull
stringers (netting, line, shock cord), and/or lockable hatch panels
. Perhaps I've just read too many stories of cruisers getting brained by a flat of corned beef tins or that really big wrench you use for the coupling, but it strikes me that for safety's sake and for the sake of keeping your stowed stuff from shifting and perhaps causing damage to hoses, conduit or from friction, it's seamanlike to wedge or tie it down, and to keep the "lids" in place. We are probably going the PYI locking route
when I get around to redoing the soles.