You have not provided enough information. The Premier allows for use across Managed Area Networks. Are you managing all the sites under the same host?
You have not provided the information required to ascertain your specific situation. Please refer to the End User Licensing Agreement. (EULA)
https://docs.storelocatorplus.com/blog/general-end-user-licensing-agreement-eula/
“The general rule of thumb to ensure stability of the product:
Install one license PER BUSINESS site
alternately ,
with Network Active Multisites you must purchase a Premier subscription.”
Are you managing a Network Active Multisite?