The system has now been upgraded to offer Opentime Alerts from multiple bases.
If you want to receive alerts from a second (or third, or fourth!) base, just add extra Opentime Alert subscriptions. On the Settings page for Opentime you will see extra base dropdown boxes appear. Configure each one to your desired base. (Note: the extra selections are not displayed if you only have one Opentime Alert subscription.)
As well as the SMS alerts, you will receive a Daily Summary email for each base every morning.