12 x 120mm fans, using PWM Y, Splitter to a PWM moatherboard

Hi guys i need your help, opinions, and recommendation. Its my first extreme watercooling build. I have 12 x 12PL Gelidsolutions fans it comes in with a 4pin male PWM header. I will be using it with 2 x Black Ice SR1 360 Rads in push and pull air flow configuration.

I was thinking of using these:

3 x 4-pin PWM (one with RPM feedback for motherboard) and PWM Y cable

Looking like this...


Questions:
1 - my main concern is damaging my motherboard if im gonna be using it for 24/7
2 - will i be able automatically control the fans RPM in mb bios with my cpu/gpu temperature configuration adjustment set up?
3 - i was also considering using Koolance TMS-205 Software Thermal Interface Controller plus TMS-EB205 Expansion but cost too much...and board comes with 3pin fans connector and a board limit of 6.5A. Although i will be able to control my Pumps Settings & so much much more hmm