Hi, Tony.
I will try to explain it to you as easily as possible.
First of all, it is the choice of the pattern depending on the variety of grape to be grafted and the soil conditions.
For sure success, I recommend grafting these three rootstocks.
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140 Ruggeri (for soils with a very high pH)
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1103 Paulsen (with moderate pH)
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110 Richter (this is an all-rounder that fits everything)
All for sale in this nursery, and in many other nurseries in the United States.
https://www.yalumbanursery.com/rootList
The most suitable grafting system for grapes is "cleft graft ", and it is done about 10 to 15 centimeters (4 to 6 inches) from the ground.
It is absolutely indistinct, graft on the ground or in a pot.
Now comes the important thing.
After grafting, a bamboo stake should be placed on each plant.
Like these
And put a protective tube like these
The protective tubes create a totally favorable microclimate inside for a good sprouting of the vines.
If a protector is not placed, the young leaves (shoots) of the vines are very sensitive to the sun, so without the protector the shoots dry out and the graft is not successful.
These are the advantages of using protective tube
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Although it seems silly, the success of the grafting of the grapes lies in the protective tube .
The vines should never be rooted (in Europe it is absolutely forbidden) since if it is not grafted on a suitable rootstock, the distribution of the Phylloxera (Daktulosphaira vitifoliae) that devastated the vines throughout Europe is encouraged.
Rooting vines is very bad practice
Regars
Jose