We tried the above ground pillow under the cover deal this year. Actually three taped together. We'll see how they hold up.
This particular cover has uncurled an eyebolt two years ago

...so we welded them shut! So last winter it ripped the same one out of the wall!

This year we moved the anchors down the wall a bit and put pillows under the cover.
It has a vanishing edge so the water level is lower than a standard winterized pools' water level.
Do you perform any winter maintenance on a regular schedule?
Scott