Wiring a switch and GFCI circuit
I am in the process of wiring my bathroom. The lighting and fan circuit has one fan, one overhead light and one vanity light. I was wanting to use a NuTone single space / 3 switch unit for all three. Wiring that is all very straight forward but the fan requires a GFCI circuit to make it OK for over tub use (which is where I have installed it). So, to accommodate that requirement I have purchased a faceless GFCI unit that I was hoping to install into the same 2 gang switchbox as the triple switch. However, the GFCI instructions say that I can't wire it into a box with more than 4 wires (excluding ground). My arrangement has a few more than that.
So the questions are:
1) where in this circuit does one place the GFCI? Before or after the switch?
2) Can I gang 2 single switch boxes together to meet the isolation requirements of the GFCI or should I just move the GFCI elsewhere like the basement or the attic?
3) What proximity does the GFCI need to be in relationship to the fan to be effective and could I place it closer to the fan away from the 3 bathroom switches? I have read that long runs can be problematic with GFCI circuits even though GFCI breakers can be a long way away (which confuses me).
4) Can I place this single 15A GFCI in front of all three devices and have them all protected (instead of just the fan) or is this too much load?
Thanks as always.