You can configure that certain employees cannot start and stop the time clock in their own user accounts, but only via the time tracking terminal on a tablet, and you decide where to place the tablet. This way, you ensure that employees can only clock working time when they are on-site at the office or company.
Read here how to, for some employees, [allow only at the time tracking terminal(/time-tracking/time-clock-terminal/allow-only-the-time-tracking-terminal/) clocking their working time.