Not in all state forms. In some, you can select more than one agent on a power of attorney. But it’s usually better to name one. With multiple agents, there is a risk of confusion or conflict among agents. Further, you will need to decide whether your co-agents can act independently. If not, you have to choose whether they must make decisions unanimously or by majority vote.
Although it’s best to avoid co-agents, it’s a good idea to select a successor agent (a backup agent). Your successor agent will be able to make your financial decisions if your original agent dies, resigns, or becomes unable to complete this duty.