I'm not sure what went wrong when BP made the manual but on my bike (2017 model) it's mounted as shown for the RC (top left side of the engine)Thanks much, but my confusion about that is because of the instructions on BoosterPlug’s web site. For the 2017+ Duke it shows the plug to use is hanging off the airbox on the right side of the bike just behind the rear shock. Then weirdly for the RC390 it shows where you’re talking about. I can’t imagine why it would be different between the two bikes.
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good luck, it did wonders for my bike and I'm very happy with it