Random appearance of object

Hello, I am trying to achieve something that in my head seems pretty simple.

I am working on a little game just for fun, the game will involve randomly appearing objects which the player then will tap/click to gain score.

My problem is to get the object to appear at several random places on the stage practicaly the same time.

I tried a few different ways to get it to work with the math.random function but I am not getting closer at all.
I assume most of you here are more experienced at this than I am so if you have the time, can you give me some hints?