I have these installed not the lowest, but one step up, it get more visibility and not turning head too much downward while driving(safety issue) i found this position more handy, and its next to the stereo.
I installed to the lowest first before..
the trim around the climate control (red arrow) was from originaly upper trim(yellow mark) you need to cut to fit.
No screwing, slide the climate control in and it stays firm.
