In my hall, I have a 3 gang switch with 1 operating as 1 way (cupboard under stairs), and 2 operating as 2 way (stairs/landing and hall).
I also have a 2 gang switch with 1 operating 1 way (porch), and 1 working 2 way (hall)
The 3 gang works OK for the cupboard, and the landing.
The 2 gang...