As the title states, I am looking for any tips or suggestions anyone might have for mounting a Garmin 93sv to the bow of my Bass Tracker Classic XL. I have purchased a Ram-D-115-C in order to mount my unit. I have provided pictures that I hope illustrate the situation decently well. Essentially the mount will be attached to a thin piece of metal flooring (shown lifted up in the pics below). My question is, should I be placing a wood block or some other material beneath that surface layer to drill into to give the mount more strength, or should I be drilling through the surface layer and into the metal decking below? I'd really appreciate any kind of help or suggestions that can be provided as I have spent all this money so far and would hate to screw it up on the 1 yard line. I can provide any additional pictures or info that may be required to assist.
Also, I wasn't sure if this is more of a boat category question or an electronics question so if I have added this in the wrong section, I do apologize.