Yes you can.
For example, you can have one subscription plan, 2 Gateways in different locations and 10 Ruuvi sensors in each location within range of the Gateways.
Gateways aren’t linked to your subscription plan. This means that you can use several Gateways to cover all your sensors. Ruuvi Gateways are independent routers that continuously listen to broadcast sensor data messages sent by Ruuvi sensors.