I have noticed that on the vertical editable signs that the text is only put on one side of the sign. Below is two screen shots that show this. When you use them in the fashion that I am showing, the text should show on both sides.
I always just made one sign, copied it and rotated the copy to face the other direction, then sank the two together so they weren't so thick. But I agree with the idea that they should be two-faced, or at least a version available. I used them at right angles to rides and buildings all the time.