Thanks for posting to the Community, @ortizj.
I can share some details that can make your QuickBooks Point of Sale setup successful. Working LAN would be great in dealing with the other nearby stores that you can utilize when using a server in multi-user mode.
Firstly, since your 12 stores are unable to attach to the LAN, I'd suggest searching for a Cloud Server to access sales data remotely that could help you set up QuickBooks POS seamlessly. This way, you're able to configure QuickBooks in your environment and track all the sales from each store at the Home Office.
I'll add this article as your reference for more details in setting up QuickBooks POS in multi-user mode: Set up Multi-User Mode in QuickBooks Point of Sale.
In case you need a reference in dealing with data transfer between your Headquarters and Remote stores, you can review this article: Store Exchange Overview.
Please feel at ease to place a comment here if you have more questions. I'm always open for your reply. More power to your business!