I am forced to anchor a rather substantial fold out sleep sofa to the salon deck to keep it from tipping when unfolded. It has a frame rail at each end with 2 screw holes. Can’t access underside of decking for backing plates. Considering lag bolts but don’t know the composition of the decking. Top layer is teak flooring. Anyone know what’s underneath and will it hold lag bolts? Any other way to anchor it?