I plan to install a transom ladder this weekend. It’s a GARELICK 2 step fold-down with 4 mounting brackets. What would you suggest for the 4 mounting screws? Drill 4 holes and use ¼ x 20 SS bolts & nuts or use 14x1” SS screws. If bolts what sort of sealant should used to seal around the bolts? If screws what sort of adhesive/ sealant to use around screws?