I use a mesh type bag I made out of a old basketball net. I use as round a rock as I can find, so far no hang-ups and it holds well.
I wouldn't use it in a stiff wind becasue if it did hang-up, it could cause problems. I could cut it free easy enough, but I don't like the idea of leaving a nylon bag in the water for critters to be entrapped.

I've never used this product, but I think the principle is sound. With a stiff small mesh bag, it shouldn't snag as easily, and the rope with steel ring allows you to spill the rocks and retrieve if you do hang up.
Could probably make your own if you found a suitable bag, but not sure how much you would save after buying the raw materials?
If nothing else it gives you a idea you maybe able to replicate or improve upon?

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