One way to do it is to spawn it at the player(or some other on-screen location), then use the "move at angle" action with a random angle to move it off screen in a random direction.
Eh that kind of works, but theres 2 problem with it:
1) No matter the speed, the spawned object shows up on screen for like a frame, which is noticeable.
2) the spawned object is meant to be destroy when it touched the object its spawning from, i get set variables that toggle when it's spawned so that it isn't destroyed, but if anther one touches the object thats spawning them while one is being spawned, it wont be destroyed, thus creating a bug.
I managed to fix that first problem just by moving to different layers