You could get by with a single stake easily. I planted mine so close together I ended up using a "Florida weave" with stakes every couple of plants then string horizontally. I do know this...the plants are so bushy when they are planted real close it was difficult to find the tomatoes!
Not sure you can see any tomatoes but here is a row, right of pic and next to the bucket. (The bucket is 14" tall if that gives you an idea of the size of the plants.)
Shoe
