Best practices for the placement of your hub include:
Make sure the hub is in a location with strong cellular connectivity.
You want to ensure the hub is not going to be accidentally unplugged or the antennas moved throughout the workday.
Ensure the hub is flat on it's bottom.
Position the hub as close to the units you are monitoring as possible.
The antenna labeled 915 should be in the port labeled LoRa, while the flat antenna should be in the port labeled 4G. Both need to be securely screwed into the hub and pointed directly towards the sky.