That issue was easy for me - I slip the cages into the pots, then secure the top of the cage to a chain link fence. You could do the same by stretching any type of fabric fencing between 2 or more posts & then attaching the cages to the fencing. There is no danger of anything toppling, either.

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Al

I used black deer netting between my deck rails. I grew my tomatoes in pots on the ground and tied the tomatoes to stakes, bird-netting and the deck, itself.

If you look between the rails, on the left side, you might see the deer netting. This is a moon flower and morning glory vine.
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Here's another shot. This vine is growing from a pot on the ground, climbing up the deer netting.
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This photo shows so many plants, but you can see the tomatoes with stakes and there is deer netting between the deck rails. I tied tomato branches directly to the deck. I used heavy metal stakes which had green plastic coating.

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Not terribly creative, but it worked and didn't look too ugly.

Jane

I was actually thinking of taking rebar and drive 2 rods per container (either tote or 5 gal bucket), then attaching the tomato cage to them. I just wanted to see what others are doing, maybe use soome other ideas.

I don't have any photos to show, but I use cut pieces of pig panel fencing to secure what amounts to free-standing trellising to. In other words, if there's no fence to attach the tomato cage to, I have tall pieces of free-standing fence made from pig panel sections. The pig panel piece gets stuck into the ground on legs that we've left intact, and I loosely tie the tomato cage to it.

Luckily, I have 4 raised beds that are fenced in, and the corners are fairly close to the fencing... close enough for vining plants to grow toward and then onto them.

Crape-myrtle sticks or pampas grass canes, driven into the containers, two at a time. I also build my own mega-trellis constructions with twine and branches for vining plants.