Subject to change ... I know exactly what you mean! I finally decided to go just below the rear speaker so I can open the little box in the wall without issue. On top the 37kg frige extension and of course the fridge itself will be mounted. And all the booze in there adds some additional mass too, so I had to make sure the whole thing is "heavy duty" enough. This is version 2 of the set up
Ah and I didnt go for Lithium but AGM. Why? Because I wanted full redundancy with my two starter batteries in case SHTF - 24V Diesel Starter here