Most endpoints have GNSS available in one or more forms. There is often a separate SMA connector available that is particularly useful for using a cabled-out active GNSS antenna. Sometimes the GNSS is shared on one of the cellular antennas. Please consult your particular endpoint product page at Endpoints | 5G and LTE Routers and Access Points | Ericsson including the Data Sheet and the Quick Start Guide link that can be found on each product page.
Good GNSS signal availability in the area is required. There are some free smart phone applications that can be helpful for determining the quality of GNSS satellite coverage in your specific location.
Please also take note of the discussion above regarding GNSS antennas and ports in the Cables and Ports section.