Yes, you can ride your hoverboard on an uphill road. Hoverboards have an incline-assist system which helps you climb inclines without putting any extra effort. Not only is the uphill journey taken care but also the downhill journey is assisted well. You can control your speed while riding downhill.
How high can hoverboards go?
Unlike the original Flyboard, which tethers to the turbine of a personal watercraft, the Flyboard Air flies autonomously for up to ten minutes, using what Zapata Racing calls an "Independent Propulsion Unit." The company has said it can reach a height of 10,000 feet, with a maximum speed of 93 miles per hour.