It is ugly but not really dangerous. You can buy shorter Ethernet cables. I have a bunch that are a foot or two long and that helps with the neatness factor. You can mix up the colors of the cables you buy to make tracing where things go easier. They also sell Velcro ties to bundle the cables but be careful not to kink them or tie then up too tight. If you pinch that Twisted pair cable, it can cause data issues.
