I am trying to find the specific rule which states where the robot must be located to start the match.
Section 7.1
G01. Know your ROBOT setup. When placed on the FIELD for a MATCH, each ROBOT must be:
…
D. set on the carpet,
E. in contact with its ALLIANCE WALL diamond plate
…
Check G01. It’s the very first Game rule. In the future, please try and search the manual or the other threads on Chief Delphi before making a thread to ask about a rule.