I used two small eyebolts and ran a bungie cord. It's all I needed to keep mine portable 12,000 from rolling around on the floor.
It's been enough AC for me. People get all excited about their favorite product, but often times others have differing opinions and success.
Give it a try and luck to you. I've enjoyed mine.
In this pic. you can see the eyebolt and my bungie cord.
