— as ramones said you can destroy the sprites at the beginning of the laoyout. I usually add a "destroy outside of layut behaviour" to keep it simple on my end. Or on start of layout I destroy everything I'll be spawning or creating later.
Also you can use the "On created" event of a sprite to check if its on collision with another similar sprite then you could re-locate it to some coordenates for example.
Lets say all your sprites are abbout 32px x 32px if one ends up touching another I would move the one you just created 42px somewhere else (42 because 'Im adding 10px separation just in case) you could use the current x and y coordinates and pick either one to add the 42px to move it somewhere else it shouldn't be too hard.