Instead of all the fancy modern up to date carbon fiber, techy, or space age plastic wonder thingamajigs ... go down to your local hardware or building store and invest in some good old steel spikes. Make sure they fit into the holes of what ever you want to hold down. You can get them either spiral or smooth. Just make sure they are at least 8 to 12 inches long. You can beat these suckers into any ground and they won’t bend or break no matter how hard you smackem. They are cheap, easy to replace and your problems are over. End of story.