you can do this easily with the "custom movement" behavior.
you can define the angle of motion for each object. (a little trigonometry will be helpful to define the angle you want)
then move all the objects at the same time by setting their speed in one event.
Maybe you need more explanation about calculating the angle :
your object is in (Xa,Ya) on the screen
the destination point is in (Xb, Yb) on the screen
the motion angle should be :