Yes, you can use your Passport membership benefit on multiple devices at the same time.
Passport activation codes can only be used once to activate your Passport with your Facebook, Google, Apple ID, or PBS account.
With every device, simply sign in with the same personal account you used to activate Passport and that device will have access. There is no limit to the number of devices you can sign in on at once, though streaming different videos at the same time may cause strain on your network depending on your internet speed.