Optimal method for multiple MOSFETs for LED driving with a shared power rail
Just like that, in parallel:







simulate this circuit &ndash; Schematic created using CircuitLab

However, if all three LEDs can be on at once, you might want a bigger power supply. The maximum current to power the LEDs is:

$$ 0.35A + 0.35A + 0.35A = 1.05A $$

This is 5% more than your power supply's rating already, plus you need to allow for some current to power control circuitry probably, and probably you want to allow some margin for reliable operation.