Notifications can absolutely go to the supervisors, you just have to configure it. It’s a two step process.
First you need to designate your company’s supervisors, and second you will need to attach the employees to the correct supervisors.
To designate an employee as a supervisor: Go to the employee edit page > select the “other” tab > check the box to make the employee a supervisor > click save.
After designating the supervisors, to assign employees to supervisors: go to the employee edit page > click the “other” tab > click the supervisor dropdown > select the employee’s supervisor > click save.