Application of load on dummy beam

Hello


i want to apply a load of 3kN/M2 on a plate element of 150mm thick which spans 0.9m x 2m so i created a dummy beam.

1) will one single dummy beam be enough?

2) will i have to convert the load to a line load (i.e: from per M2 to per m) or apply the same 3kN/m2 load on the dummy beam?