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Well, there's a device on the Tesla Shop, for looping the cable like a stub from the wall. There' different solutions. Here's one called Gecko's Toes. Amazon or ebay.
Looking for something to hold the UMC knot? Some of us use a bicycle bottle holder. Works great for $5.0
+1 for the idea to use a bicycle water bottle holder for the UMC, that's what I use.
And to hang the excess cord I have an inexpensive garden hose hanger
p.p.s. I've encountered a number of destination chargers which use the $25 plastic cable organizer, pictured above at the bottom of Akikiki's post. But in my experience, the charger plug-end often doesn't seem to stay nicely in the receptacle as pictured unless the cable is wound at just the right way and the plug enters the hole at just the right angle. So usually you just find the cable and plug just looped around, same as using a garden hose hanger anyhow (i.e. IMO no difference using a cheaper alternative than the official $25 piece of plastic)