Hi,
I have a hallway that has 3 switches that control one light:
One downstairs which looks like a 2 Gang 3 Way Switch:
https://drive.google.com/file/d/1qh0p65ihNSbZuVfIubZmtnAXoGaNT3MH/view?usp=sharing
Another upstairs which looks like a 2 Gang 3 Way Switch...