Mercathode Controller Mounting location

Where do you have your Mercathode controller mounted? Engine or transom wall? They pulled both engines and are now putting them back in. Somethings just don't look right. I swore they were mounted to the transom wall to the right of the inner transom assembly but the mechanic says that they are "always" mounted on the engine.
It's 5 O'Clock Somewhere!
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2018 Cherokee 39RL Land Yacht (Sorry...)
Regards,
Ian
The Third “B”
Secretary, Ravena Coeymans Yacht Club
https://www.rcyachtclub.com/
Go Steelers!!!
Go Steelers!!!