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You will definitely have to replant each year. These will not withstand your temperature range. It can be grown in the warmer months, but will not do well when it is cold. "Wild Peanuts" can be aggressive, but they just will not tolerate the winters you receive there. This will be best used as an annual.

This website offers some insight: http://edis.ifas.ufl.edu/wg216

The shape will not matter at all. 6 peanut plants will want a good 10 to 15 gallon size pot. This will often be too heavy to carry so place it where you want it before you plant. I recommend using separate 5 gallon containers for the best results, but planting them together will be fine also. The height won't matter so much either, as long as you have enough soil to support six peanut plants.

I'm reading that perennial peanut seeds should be planted 1/2-3/4 inch deep in spring. The seeds germinate in 10-14 days. Use at a rate of 1 pound for 1,000 sq. ft. Water to keep moist until fully germinated and then regularly during the first summer. This species is rated for zones 8-11. It prefers a pH of 5.1 - 6.5.

We don't usually recommend places to purchase. I would check around with your local nurseries and garden centers, or online. Many online vendors will have what you are looking for on sites like Amazon, Etsy, or Ebay.

We do, however, offer information on the growth and care of them! This collection of articles will help: https://www.gardeningknowhow.com/edible/vegetables/peanuts/caring-for-ornamental-peanuts.htm

https://www.gardeningknowhow.com/category/edible/vegetables/peanuts

You will need to find the extension service in your area and ask for a Field Estimate table. Here's an example of one from Texas to help: http://publications.tamu.edu/PEANUTS/PUB_peanuts_Field%20Estimate%20Technique%20for%20Peanut%20Yield.pdf

Here's a collection of articles that may help: https://www.gardeningknowhow.com/search?q=peanut%20planting