Which power unit can we use?

Hi, I’m the beginner in the PX4.
I use my custom structure frame, 6 x Hobbywing X9 KV110 with 120A FOC ESC,Cube Orange with Here3, Futaba T16iz and 2 x Tattu 12s Battery 16000mAh.
So I dont know how to choos my Power control unit and BEC for my Cube.Anyone can help me? TKS.

Mauch power, or PowerBox, or Castle creations