Did you just do four stakes up, grommets at each corner and hang? I thought about that originally! Do you have a photo?
I have mine tied off to various things, depending on location - trees, fences, balcony railings, etc.
Here's a shot of the grommet. I bought the kit from Home Depot. Once I figured it out, it takes about 3 seconds to pop one on. I also used an edge tape to make the edges tidier. If you are handy with a sewing machine, you can run a couple of stitches on the edge tape. Or if you are less handy (like me) you can use glue and/or staples.
Here's a shot of a smaller patch of shade cloth tied off to some trees.







