If these are voltage controlled fans, you can use poweradjusts to control them each invdividually. It will cost less but controlling each fan makes no sense and will cost an arm and a leg but to each their own.
Farbwerk and poweradjusts can be daisy chained to each other and or plugged to a SPLITTY9 as that can act as a Aquabus hub.
IIRC, you can use both displays yes and have one as a Master while the other is a slave if you decide not to go the poweradjusts route.
As you can see, there are many ways of going about this.