This looks like a good option. Mount for $30, device holder for $40.
ProClip 2020 Mazda CX-30 Dashboard Mounts provide a secure mounting platform to attach a phone, tablet, GPS or other device.
www.proclipusa.com
ProClip Adjustable phone holders without charging
www.proclipusa.com
Alternatively you can get one of
these cheaper options that clip on to the vent to the right or left of the steering wheel. I use something similar in my CX-9 and it works just fine. It should also work with the vents on the CX-30, but don't quote me on that. The negative to this type of mount is that it will block air flow coming from the vent it is clipped on to.
Then there are the suction cup mounts that attach to the windshield or dashboard,
like this one.
And finally, if you're okay with sacrificing a cup holder, there's
this type of mount.
All depends on what type of mount you want and where you want it.