Building x6 GPU's Sapphire RX 570 rig

Hello guys.
I'm still newbie here but from 2 months, I collect a lot of information and I'm ready to build my first rig. Till now I was Forex trader also trading with Ethereum and BTC but decide to get into the mining business (hope I get the right deicsion because I saw some information about PoS of ETH hoping I'm not late with the rig). So, I already order the parts for my new rig and they're coming soon. I need your professional opinion especially for the GPU's because I'm still newbie.

Hardware:

- 6x SAPPHIRE PULSE 570/ 4GB DDR5 - (this is the only GPU's I found at the moment)
- 2x 700W Fortron Hyper
- Motherboard Asus Prime H270 Plus
- Intel Celeron G1840
- RAM 8GB DDR3 1600Mhz
- 128GB SSD A-Data

I hope I can reach ~175MH/s ETH mining with this rig and around 1000W energy consume. Currently the price here is around 0.10$ per kW/h. So, hoping to get 5-6months of ROI. What do you think, guys?
Thank you in advance.

Regards,