Hi! I’m no grammar expert, after all Georgia is probably at the same quality education that Alabama does, but I don’t think "premise," is singular for "premises." A workload is not "on premise," it’s either "on prem," or "on premises."
Yes, the interwebs are awash in debate over the proper terms. According to the grammar police, "on-premises" is the proper term but I guess "on-premise" has been conscripted by many many others the same way that "ya’ll" has been to become common parlance. I personally use them interchangeably without guilt or consternation as I’m a grammar rebel.
Ya’ll take care now.