Can I get two charges of crystal charge when I ult someone inside of my crystal spires?
As the wiki page that you linked says :
While within range of a Crystal Spire controlled by his team, or while an enemy is stunned with Fracture or suppressed with Impale
So it doesn't stack up. It's as soon as one of these three requirements is met, you gain X bonuses. Have multiple of these doesn't give more bonuses.