I used to ground amps right where the gas tank mounts, with my last two, I ground to the battery. The reason for a short ground is not to pick up any strange interference, I haven't had a problem, plus I don't have to try to scratch the paint from the frame for a good connection.
2010 FLTRX With Plenty of extras, goes by the name "Hardeshia"
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Also not pictured 2016 FLTRXS and 2017 FLTRXS, you never can have too many SHARKS......