Hello,
Please be aware that Inventoria doesn't have the ability to synchronize with other Inventoria installations, only with Express Accounts, Express Invoice and Copper: https://www.nchsoftware.com/inventory/kb/1289.html
You'd need to install Inventoria on one computer and register one license in it. The Web Access feature sets the computer where Inventoria is installed as a web server that must remain turned on, active and with Inventoria running in order to provide account-based remote access to the program's information for users on the local network and, with the right configuration, over the internet.