You don't need to have your speaker cables in a straight line. Where did you read that? Just keep them more than 6" off the floor and all will be fine. I use a 3M tape on wall hook for one side and a wire metal piece (intended for something else) for the other side to suspend the cables.
It's no more clutter than the cables themselves and makes for easy cleaning of the carpets around them. It also helps to have not lots more cable than you need and therefore, not much more to suspend.
All the best,
Nonoise