At least for Tripoli, that is not correct. You only have to fly one L2 rocket using an electronic device to deploy recovery. It can be single deploy. Dual is not required. An earlier section states "demonstrate proficiency in flying Level 2 rockets with electronic recovery." Regardless if it is one or more rockets, dual is not required.
Also, you do not have to do dual deploy for the L3 certification flight. You must have two seperate and independent devices, but you can do a single deploy only. For example, each device can deploy the main only. One is primary and one is secondary (backup).
5. Electronics:
- Successfully fly at least one rocket in the Level 2 range using an electronic device as the primary means of recovery system deployment before attempting Level 3 certification.
- Level 3 certification flights must include two completely separate electronic devices, each with independent power sources, wire harnesses, and ignition devices for recovery system deployment.