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I mounted mine up front of casting deck against the hull, mainly for protection against snags and stuff (sometimes I gotta go in to retrieve lures lol)
Not sure about codes, the rail mount is meant for motorbikes, I wanted one with 2 ball mounts, so I can mount my gps on there too, and the mount for the sounder was the universal one, think they do some to suit specific sounders too, I just looked on the RAM website and found what I wanted then searched the codes through online shops. They hold really well, I also run a mount in my 4x4 for the GPS and it doesn't move at all, no matter how rough the roads are