(Oh, if you haven't read the earlier posts in the series yet, I suggest you do that first and come back here - CLEANSING; EXFOLIATION - HERE & HERE).
Okay, so toners. You either use them or you don't. I fall in the former category. I like using them - yes, at any given point of time I have a couple going - I choose depending on how my skin feels or I alternate between them or use 1 in the morning & 1 at night.
You don't need 2 or 3 necessarily. But if you aren't using any yet you might want to add 1 in your routine and up your skincare game a little.