I'm fastening down a good quality (solid core) plywood underlayment for linoleum. I'm using nails along joists and mostly screws otherwise. I'm probably using more fasteners than strictly necessary, and it feels really solid. But I can't get fasteners closer than about 4.25 inches to the edge of the underlayment when that edge goes under the toe kick of an existing cabinet. Is that a problem? If it is, what's the solution?