The photo shows what I do, to protect newly-planted grapes from rabbits and deer, while the grape establishes itself. Bamboo stick holds the cage at the lower part, and I also attach the top of the cage to the lower trellis wire... The cage is 2' hi and an 8-10" diameter is perfect. Keep the cage easy to open cuz for removal u can't lift it up off the grape, like u can for a fruit tree (because the grape will have permanent cordons (arms).
Grow tubes also work but it's a myth that they help grapes grow faster. I don't mess with them. Why buy plastic when you don't have to?
And: Notice the slope of my vineyard! Row 1 is 33 degree slope! and Row 6 is 27 degrees. Sloping my vineyard to the south means I can ripen grapes earlier (more sunshine energy per square foot falls on the slope), and in a cool year I can ripen fruit when flat vineyards can't. Come check out Epona Vineyard! Not large but since when does size matter? It is ideas, and quality of execution, that matter most.