You may laugh but currently this is my best solution to prevent the phone from tipping over. I've tried expandable and flippable supports and I'd love to have a side arm on the left side but I didn't find good solutions for mounting it.
The wire is great. I've superglued it onto the hinges and it holds the phone perfectly. It also makes the tilting mechanism way stiffer as the top part is now supported from both sides (the other side is a magnet).
My only fear is that the fishing line could lengthen over time.
If it doesn't work, I might try a stiffer wire. For example, I've found