Richard,
I am not sure about the Unique trunk shape as I have a CR, but I have had my optima battery mounted behind the right wheel well since 1997. My trunk is carpeted and I have two small hooks bolted through the carpet and use two nylon straps that go through the hoops and over the battery and just cinch them down. I have never had a problem and I use the side terminals as I could bring the cables up and they are not visible. I also got the top posts as I keep a small battery tender on it during the Winter and I don't have to unhook the straps and move the battery out to get to the sdie terminals. When I am driving I put the two small plastic covers on the top posts.
Ron
