Managing Multiple Devices

Hi, I'm deploying 150 Android devices as handheld scanners for my staff here, I have logged each one in under the same Google Play account, but the first devices I deployed are asking to be re-verified with Google. Is there a way to increase the number of devices allowed under a single Google account? These devices are not linked to specific users, and do not have email addresses associated to them, so I cannot use a separate google account for each. Is there an upgrade to my account that is possible? Or is there a better way?




Thanks.