You do not need to charge the same rate for all your teachers. Each teacher is assigned their own default lesson price, and even that can be changed on a per-student basis. When you assign a student to a teacher, you can input that student’s unique lesson price with that teacher.
You can even mix and match billing types on a per teacher, or per student basis. Some teachers in your studio may charge a fixed monthly rate regardless of lessons taught, while others can charge hourly. It’s completely up to you.