The bottom of the cabinet and between the two shelves seems to be built like a hollow core door. The bottom layer presses in almost a half inch everywhere. If there is a solid piece of wood, I can't find it. I don't know how heavy a knife rack is when it has a few big knives on it, but I sure don't want it falling off. Should I try to use the adhesive strip that came with it, or screw it to the thin luan with wall anchors?