South facing roofs aren't essential to solar. East-West layouts can spread the energy production out through the day and work out better overall depending on various factors such as how much you make from selling excess to the grid.
These are tiles that sit flush with your roof, east west roofs act like zero tilt panels which provide less power everywhere in the US and thus lower efficiency. Granted if it's cheap enough that's not a deal breaker, but it's always going to impact ROI.
