Behind the basket seating on the 300 level is only available in sections 309-315. These sections are farthest from the court and are widely considered the worst seats in the arena. Of course, fans considering tickets in these seats are doing so because of their low ticket price.
To get the most out of seats in this area, choose tickets in the first five rows (row A is at the front) in one of the sections closer to the corner. Being lower down will give you a slightly better view, but it will also have you walking a lot less stairs than if you were seated near the top. And being closer to the corner will have you less obstructed by the basket.