Even thought that plant is young-ish, your going to have a tough time getting a hard 90° bend on that stem.
If your goal is to keep the plant low, I'd suggest topping the plant (cut it just below where the wire tie is right now on main stem), and then LST the 2 new tops on the node below. They're still small/pliable and will be much more easily manipulated to grow flat/horizontally
Here's a top down pic of my current plant. Grew it to the size your is now, topped it, then began LST from there.
Of course, it's all dependent upon your goals. What do you intend to accomplish with LST?