That would only work on metal ground. The board would have to be really big to create enough magnetic power to counteract its own weight and get it off the ground.monorails have an alternating charge in the rail and electro magnets on the train that alternate to both propel the train and hold it above the track.
That hover board would work on a half pipe made of all magnets. Gets some supper glue and go nuts! (Just remember the polarity needs to be apposing...)