If its like mine, with the 2 knobs and belt clip case, I let the wire come under the left side of my coat and clip the controller to the belt or side pocket of my coat. I like enough cord slack to be able to stand up, so I bought an extension for my power cord that is like an old style coiled phone cord.
You could put a mounted controller on the handlebars I suppose, but I only need heat 3 or 4 months of the year. I dislike all the extraneous electronics on handlebars/dash areas some riders seem to accumulate. Do not like tank bags either.....me OCD.
"If its not broke yet, it can still be fixed"