Optimal SSD based RAID 0 config

I would like to ask the community for their kind support. 

I'm looking for the optimal configuration of postgresql 

under the following assumptions:

# Database usage scenario:

```

* daily bulk upload of several million rows of financial transaction data

* Statistical analysis (possibly machine learning) using pl/R and pl/python

```

# My hardware spec:

```

* ASUS WS X299 PRO/SE LGA2066 ATX

* SAMSUNG 850 PRO SSD 256GB intern SED 6,4cm 2,5Zoll SATA 6Gb/s

* INTEL Core i9-7900X 3,30GHz LGA2066 13,75MB Cache Boxed CPU 10K

* 128GB DDR4-3000 CL15

* 2x HGST ULTRASTAR SN260 SSD HH-HL 3200GB PCIe MLC RI 15NM HUSMR7632BHP301

```

Operating system is Linux (preferably debian jessie or gentoo).

I would like to use the 2x ULTRASTAR SSD PCIe in raid 0 mode to maximize

the I/O throughput.

In particular I'm looking for the the allignment of the following parameters:

```

* postgresql block size

* Kernel PAGESIZE

* RAID stripe size

```

Best regards and many thanks in advance