Yes. You can name two or more agents to act on your behalf or create a system where a second agent is granted duties if the first agent dies or becomes incapacitated. However, because of the powers granted to agents, beware of naming too many agents.
Each agent has the right to act on your behalf, and resolving conflict between two or more attorneys-in-fact can be fraught. Imagine if you have two people differing over whether or not to sell an investment property. You may miss the best time to sell while their conflict plays out.