It is a fairly upright one. But all mine are trellised. Fall Gold and Anne definitely need a trellis. The tops get heavy and the start to fall over. You could probably get away with no trellis with Prelude. If you take the summer harvest on fall bearing, those usually benefit from a trellis.
I'm still getting huge daily harvests! Unreal this year. The summer harvest is almost over, but a good week of decent harvests still expected.

Hey Drew.......here's a pic of my Prelude, i'm getting a second wave on the lower half of my bush for the summer crop, i also have buds growing on the bottom of last years wood so i guess they will fruit too ?......./here you can see my Primocanes from this year getting pretty tall now