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The trick with cable (I used to be a sound engineer) is that they have a natural turn to them.
So you want to coil it up, but for every loop you turn the cable slightly in the direction it wants to turn itself.
This way you end up with a neat, flat, coil that is not fighting against itself.
Practice a couple of times and you'll have it down. Applies to all types of cable.
Good old over under technique! Works with everything, done right you can literally throw a cable across the room and it will unwind itself perfectly. Highly recommended for headphones as well.
Another tip on top of this stellar one! If the cable is giving you problems, i.e. it's "natural" shape is all kinked, you can leave it out in the sun for a little while. Straighten it out from there and then you can coil it freely. The heat helps you reset that natural shape.
I used to do live events and I’m so happy to see this answer. It kills me when I see someone coiling up cable around their forearm.
Ethernet bobbin.
Permanent in-wall connections are rarely impossible. It's just a matter of how motivated you are to achieve the best solution for performance, reliability, convenience and safety. (Stringing it loosely up a flight of stairs? Holy trip hazard.)
The safety stuff is absolutely true but I have a thick brick cement wall house. To get the wires in-walled you'd have to dig holes and scrape into the walls. It takes a lot of money & time.