How to know internet usage for every users in the house?

Hi,

We have a Macbook Pro, 3 iphones and a Samsung in the house all connected to the same wifi modem but only 80G per month.

Through the ZTE MF253 modem, I can see what device is connected (MAC address available) and I can disconnect each one of them if necessary. I'd like to know if there is a way through terminal or application or else to know how much bandwith each device has been using per day per week or even per month?