1 on metal ramp just in front of BG face R/H side (I put mine on the left, thought it looked better there)
2 on clear perspex directly under BG on under side of play field using spacer provided
1 if you look directly down on BG along R/H metal ramp you will look through 2 plastics to what looks like a cut out install so it is facing the edge of metal ramp along the metal guide. (stick to metal guide)
Hope this helps will post pics tomorrow if you still need them