The C40 is a very useful controller for wind or hydro on 48V systems.
In your case, for 12V, the C60 is the better option due to the higher current.
While it says a limit of 55Voc, you still need to select "12V" panels with a Voc between 20 and 25V. This puts Vmp around 17-19V. They must be placed in parallel.
The total Isc of the array should be less than 60A.
If you select panels with higher voltage, you waste everything above battery voltage.