Triple Ferret Nation Cages

I have each of my chinchillas in a double ferret nation and I’m considering adding a 3rd unit.

Is 3 floors too many for chins?
If I did give each chin a 3rd unit how shall I go about spreading their water bottles and food out.
example:
Unit 1: oxbow pellets
Middle unit: water bottle
Top unit: hay feeder

?

Just need tips maybe pros and cons of having a Triple stacked ferret nation.