Floor anchor pots

So, I finally started building my AMD "style" chassis jig, which is no where near as strong as a proper frame jig I know. Well, I got to thinking after seeing those "pull systems" that use floor anchor pots, how might they be of use and I think I could use them in a few spots, including augmenting the jig.

A big one not related to the jig, seems to be wherever the rear of a car might be so that I could wrap some chains around the rear axle housing as a safety in case something let go while working on a car, this preventing one from launching through the shop. They're supposed to be good for ten tons each.

Anyone here use/install them? Any regrets, or suggestions?

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