Remove the lower center panel on the driver side - it houses the a/c vent to keep your nads cool in the summer.
Then look up inside, between the steering column and the frame for the dash, there's a spot there you can install it and then zip tie it down.
And for added good measure I even made sure the sliding door that conceals the two knobs was facing outwards and up against the front of the dash.
That way if I should ever want/need to make an adjustment I can.