I ended up building a box out of coosa which encloses the back of my existing smart plug and the new ELCI master breaker. Here is a pic of the installation. It’s a bit wider than it needed to be, but I thought the extra space inside might be handy for fitting the wires. It was actually easier to wire the ELCI outside the box and then fit it in, so the extra space wasn’t really needed.
I have it mounted very close to the galvanic isolator, which meant dismounting the isolator to install the breaker but also helps keep the breaker switch protected from accidental knocks when putting things into the lazarette.
I have it mounted very close to the galvanic isolator, which meant dismounting the isolator to install the breaker but also helps keep the breaker switch protected from accidental knocks when putting things into the lazarette.