surround placement

Hi! I currently have a 5.1 speaker system and have 2 extra speakers available. In the picture below you can see where i want to place them. The idea is that the sound bounces on the roof onto the listeners. I am not sure as what kind of speakers i would mark them in my AV. Do is say top...

Note: Right now I am a beginner to actually setting up a dedicated system I just watch lots of Youtube in the hopes I can have a great system someday. So I apologize in advance if I'm asking an extremely novice question or should be asking somewhere else. TL;DR look at my attached movie room...