Question about parallel connection
It's always a good idea to put a series resistor with the led array, remember they're semiconductors and without a resistor they are very sensitive to voltage changes. 
If you're not using a series resistor you should use the PSU in CC mode and define the total current that will flow through the whole circuit (in this case 4.6A) but only if the 4 units are exactly the same.
Something to take care about is that if one of the units fails the current won't flow through this path, so the 4.6A programmed will be distributed among the other 3 units, in which case each one will drag about 1.5A and they can be severely damaged.