Wich cables 3 phase Multi RS

Im am building a 3 Phase system with 3 Muli RS 25m away from the house.

What is the best power cable i can use, and how many do i need for it ?

i thought 3, 1 for the RS, 2 for the loads?
or can i just pull one and install a extra fuse box next to the Victron system and from there power everything?

There is a electrician who will connect everything but i want to make sure everything is there so he just has to connect it