Random spawns but not on top of each other?

Im having some difficulty more than I should creating random spawns for my actors. The problem is i dont want actor a to spawn than have another actor a or b to spawn and overlap each other. Is there a way to make a spawn and create some kind of buffer around it so I can ensure no two spawns will appear overlaping??

The idea is to use the scene palette actor loops to see if the randomly-generated position works and have it keep looping until it does. For example, this coding should work (if you want to understand how the position check works, look at slides 31/32 in this tutorial: http://www.stencyl.com/help/viewArticle/163)