Xiaomi Redmi Note 3 Pro Prime NEED more info

Hi guys, I'm planning to order a Xiaomi Redmi Note 3 Pro Prime (3gb ram. 32gb ram) from a Chinese seller. I asked him to not open the box and leave the stock original rom on the phone so he don't flash his own rom. I want to know if it is possible to flash the North America (Canada) rom after if there is one of course. Also, I need root access to my future device and want to know if that will void my Xiaomi warranty. I would also like to unlock the boot loader and get TWRP for weekly backup etc.. can you guys please answer to those questions? Meanwhile, I will be collecting information all around the web.

Thanks for all answers in advance!

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