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If you need a half car cover, here is where you can get one. North American Custom Covers. Get the one for a 911 Porsche. I had one for my spec miata and later modified it to fit my rx7. It fell apart, so I thought I would try the one for 911 and it fits perfectly.
At the moment it is not held down by anything, it is pretty stiff so stays in place unless there it is windy. I am going to sew to straps onto the back to either clip on the back edge of the hatch glass or tuck into the closed hatch (with some "lumps" sewn in to keep them from pulling out).
One of the race shops that used to prep lots of Pro7's had a bunch of these made locally (Bakersfield) and I always thought they were really handy, especially at the track. He no longer had the ability to get any made, so I have been looking for a long time. The one I had for my Miata (from the same company) lasted about 5 years in constant SoCal sun. Seems like a reasonable life to me.