What case will you be using?
The problem with sli and M-ATX motherboards is that there can be no separation of the graphics cards. The top card will run hot and get starved for cooling air with a fan type cooler.
A blower cooler for the top card is best. I suppose a fan type cooler would be ok for the bottom card, but even then a blower will get hot air out quicker.
Yes, EVGA does have blower coolers for the GTX970:
http://www.evga.com/Products/ProductList.aspx?type=0&family=GeForce+900+Series+Family&chipset=GTX+970
The coolers are not the excellent titan coolers to save costs.
But... since Maxwell runs with less power, they will be cool enough.