I just use heavy nylon string and hang by one foot.

I have a chain one I bought for my daughter to hold rabbits it works well enough can make things slow but never been a big numbers guy. Before that I just used a rope wrapped around the leg.

But im a use what's around guy lost my deer hangers when we moved so the last 9 years I just used an ax or maul through the tenders and clove hitch arounf the middle or hooking a chain fall through one of the tenders and hand it from one side. Im to cheat to buy what is available when I can make much nicer out of higher quality materials. But I never get around to it.

You could put the base with the clamps in a 5 gallon bucket and fill it with quickrete....works well for me and you can move it out of the way after the season is over.