Drum Room with roof shaped vaulted ceiling??

I bought a house with vaulted ceilings in the living room and thought this would be the best space to make the 'drum room'. The ceiling is shaped like the roof; a triangle with the highest point meeting in the center of the room. What would be the best places to start testing where the kit should be placed in the room? The room is 20x27. The height is 15' at the top angle and 8' where the ceiling starts angling up from the wall. The center of the room, directly under the triangle peak? One of the sides where the wall begins to angle upwards? Under the highest angle, but against the wall? In the corner? Gobos or no gobos?? Thanks! Rich [removed]

Even if you don't know, what drum room position has spawned the best results for you? Thanks in advance.

in the middle of the room. you got any questions concerning sound-room build?