Thank you for reaching out! For your application we need to look at an alternative to a roof rack on your 2017 Mazda CX-3 because the Thule Tepui Explorer Ayer 2 Rooftop Tent, like the part 901201 in blue, is not supposed to be installed on a roof rack that uses clamps to install on the vehicle. This is because the weight of the tent could damage your roof. Any rooftop tent that I've looked at the instructions for have this same instruction - they are only supposed to be installed on roof... view full answer...