Wooden stakes are an excellent way to secure your fireworks and here we have a pack of 9 square stakes and a roll of 50mm x 20m white cloth tape.
By placing the stake between the firework and the audience and securing with the tape you have pretty much guaranteed that your firework wont fall over. And in the unlikely event that it does, because the stake is at the front then your firework wont end up pointing at your audience.
When taping, be sure to not cover the fuse. The white tape is also usefull for putting on the top of the firework to write information on such as an arrow pointing to the corner where the fuse is.