Uhhh....I would get a different boards....I would recommend a Gigabyte or EVGA motherboard, as Asus and Asrock are known for having seriously bad customer support. They lie about their products.
I own the Asus ROG Maximus Hero VII motherboard and testing has shown that my board's m.2 socket cannot be booted from. I then went to Newegg's page to check and a rep pop-up appears saying I could chat with him/her. I asked if the motherboard (that I already had) could boot from the m.2 socket. He/she said yes. Not to mention the multiple instances I found my motherboard not wanting to start and other random occurrences. For a $260 motherboard from Micro Center I expected better.
Trust Newegg reviews. Asus seems to be either fine or a nightmare, with tons of problems. Asrock seems to be really stingy over customer support. I could find no 4 star or more reviews on Newegg for a Z170 motherboard except for this one
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157636 which still seems bad if you read reviews.
Gigabyte I found had some issues....but hardly any about customer service. Same goes for EVGA (other than their FTW Z170's weird useless 6 pin supplementary power that is blocked by the PSU....not a big problem but weird) that have great customer support.
I think the G1 from Gigabyte would be a MUCH better choice.
http://www.newegg.com/Product/Product.aspx?Item=9SIA2W03VR9011
Some complaints over sound, but you could buy a PCI audio card if that happened.
Or the EVGA FTW Z170 motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E16813188178