Battery relocation question

[Rittmeister]

I am planning on moving the battery in my S13 coupe to the trunk soon, using a Summit relocation kit and a few other goodies. I've got the routing for the cables figured out and so forth but I'm wondering how to secure the battery box to the trunk floor. Should I just use a couple fender washers and bolts, or what?

This is the kit I'm using: Summit SUM-G1231-K - Summit® Premium Battery Relocation Kits - summitracing.com

Anyone have experience with it? If so, does it include a means to secure the box?

Also - where in the trunk is best? I prefer to mount on the passenger side (if I'm going to do this at all I might as well get better weight distribution) towards the back, but that's right over the fuel tank; I don't want to go drilling into the trunk floor only to stick the drill into the gas tank underneath.

I wouldn't do this at all but I'm getting tired of my little Miata battery going flat in the winter... cold+less driving = tired battery

Any thoughts appreciated.