I am very new to boating and learning more with each day. I recently purchased a 1971 Larson Tri Hull. It is in great condition with motor (Johnson 85hp) in good working order. I want to secure the battery. I see that there are battery cases that resemble a plastic box or a plastic frame that the battery is placed into. Does it matter which of these I should use? I understand that if I use the "open face" plastic frame then I need to cover the terminals with a plastic terminal covers. Can I screw the frame or box (whichever I use) directly into the deck? The deck is mostly covered with marine grade carpet.