That's a good place that you have

This photo is a Summit battery box with a Speedway Optima hold down bracket inside:



This is where mine is mounted:



And a poor photo during the early part of my wiring:



I have the starter relay on the fender side, the master on/off switch on the front side and an oops on the left side (I cut the ground wire too short but am using a commercial mounting post for the correction).