Tomato supports

I’ve seen them for sale from time to time. Never used them.
I do something similar in the tunnel with string. Tied to a bar of the tunnel. Other end with a knotted loop.
That the tomato gets planted on top of. So it’s own roots hold it in place. Then just twist the tomato round the string as it growing. Obviously that’s wouldn’t work outside.

That’s how I grow my tomatoes in the poly tunnel