I have found on my C310 that the stands are best placed where the sling marks are for the fore and mid stands, and one foot forward of the aft cleats for the aft stands. This is in addition to the bow stand, of course. The hull is structurally supported in these areas, whereas the hull is subject to "oil-canning" if the stands are placed randomly. I have found this out the hard way, although the hull suffered no permanent damage. As stated previously, the weight of the boat is supported by the keel, and the stands are only snugged up to the hull, to keep it upright. Don't forget to run a chain from each stand to it's counterpart on the other side of the hull, to keep the stands from sliding out of place. In addition, my boat is placed on loose gravel over dirt, so the stands are mounted on plywood, and checked for snugness several times during the winter, since the stands will settle, and could become loose.