The app needs a provisioning profile to run on a device. Xcode can create one for you even if you're not a paying member but I guess it lasts only for a few days.
Since you have an account you can register the iPads and create a provisioning profile either for development or ad hoc distribution. The profile expires after 12 months, after that you'll need to sign the app again and install it on the devices. That's why I prefer ad hoc, I create the archive, sign it and send a link via email to the customer so I can handle it remotely.
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The app needs a provisioning profile to run on a device. Xcode can create one for you even if you're not a paying member but I guess it lasts only for a few days.
Since you have an account you can register the iPads and create a provisioning profile either for development or ad hoc distribution. The profile expires after 12 months, after that you'll need to sign the app again and install it on the devices. That's why I prefer ad hoc, I create the archive, sign it and send a link via email to the customer so I can handle it remotely.