R730XD Server with 24 x 2.5" sas 12gb bays. Question about the HBA330's and cabling

I had the seller swap out the Perc raid card for the HBA330 (mini - it's a duaghtercard) and I also ordered two addtional HBA330's (Pci-e) so that I could connect all 24 drives. (I'm going to try and get Nutanix Community edition running on this, so no raid needed or wanted; failing that, will try freeBSD/ZFS.

Any idea of what SAS cables I need to go from the four ports on the back of each of the PCI-E cards; and also - what the best pci-e slots should be used, for these two HBA 330's? I will be adding a dual port Mellanox 40GbE nic.

Also, if I want to get a couple of nvme 2.5" drives for those two back bays, to use for OS, is there anything additional I would need or can the motherboard support those two drives?

Thanks in advance, any pointers in the right direction would be greatly appreciated.