Meaning end to end north/south or east/west or somewhere in between? I have a large garden and live in the Tweed Valley northern NSW? I have two vines to plant, so I thought I could put one either side?
Which Direction Should My Trellis Face for Wisteria
Wisteria like lots of sun, so keep that in mind when placing your plants. I would think placing the trellis along the east/west axis would be best. This article has more information: https://www.gardeningknowhow.com/ornamental/vines/wisteria/growing-wisteria-proper-wisteria-vine-care.htm