Unfortunately I don't have a pic--kind of tight there to snap a photo.
When standing outside the RV and looking into the door/step area I put it on the left "wall" of the battery compartment.
Edit: Yeah I installed it in that "empty" spot on your 2nd photo between the breaker and that terminal (although I think I only have the breaker). Although I think mine is on the other side of the compartment.
Something like
this guy (Amazon).
Edit 2: You could always simply trip the breaker and use that as your disconnect.
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