I think it depends on how the deck is built. If you have storage compartments you'll probably want to secure the deck. If not you could probably get by with just setting it in place. On my current build, I predrilled holes in my aluminum bracing and then screwed the front deck to the bracing from underneath from the hatches doors. If if I didnt screw it down I would have had major issues with the stability of my bow seat. On my first build I screwed it from above with small screws and the heads are barely visible.