You can only win one Blitz Jackpot at a time.
However, it is possible to win multiple Blitz Jackpots in a single day. This means you have the opportunity to win the Blitz Boom Jackpot and the Blitz Rush Jackpot on the same day.
You can also win a Blitz Jackpot at the same time as a game-specific jackpot. Blitz Jackpots are completely independent from other jackpots.