Speaker Holder

I needed to hang my speakers on the living room wall. I wanted them to point in a 45 degrees angle to the center of a living room, so I designed this part.
I'm using two #8 - #10 screws to attach this part between the two walls in the corner of the living room and one #8-32 flat head Phillips machine screw with two bolts in the center of the part as the hanger of the speaker.