You can move your current QuickBooks Desktop Enterprise setup to the cloud without buying four separate subscriptions. The limitation you likely came across earlier applies to QuickBooks Online, not hosted QuickBooks Desktop.

With hosting, you keep your existing Enterprise Contractor edition and all four company files under the same license. You simply access the software through a secure cloud environment, which gives your team the flexibility to work from home or anywhere with full desktop features, job costing, and reporting.