If I met a group of people, all of which I respect greatly, how would I address the group of people?
I am only unsure because I heard that "您们好" is not common.

Question

Answer

It depends on the scenarios:

If you are making a speech or an address: 各位貴賓 （各位+ honorable guests / Distingushed guests) +大家好 （您們好 sounds from textbook）

If you are visiting/receiving a group of professors/Enterpreneurs/Doctors : 各位教授們/企業家們/醫師們 （各位 + title) +大家好

If  you are visiting a group of elders/experts with honorable social status : 各位長者們 /賢達 （semi-formal)  +大家好

Answer

The easiest way  is you can  say  大家好！

Answer

大家好da4jia1hao3
各位上午好ge4wei4shang4wu3hao3
你们好ni3menhao3

Answer

You can say:
1. 各位(greeting)
2. 各位(noun)(greeting)

Example sentence:
1. 各位早上好
2. 各位老师们大家好