I'm set on using a single Li-Po for a whole 10-servo robot, splicing the power with those Wago connectors into three step-down converters:

1. 5V for Arduino Uno & PWM driver with 7 servos (6V would be acceptable as well for both, I believe),
2. 6V for 2 servos for that precious torque,
3. 7.4V for a higher range (6-8V) servo.

I can't quite imagine though, if the current distribution will be so convenient to just feed everything with what's needed. Cases of voltage drops and interference with Arduino seem to be mentioned frequently. I don't have the whole setup yet to see how it behaves, but even at this stage I could use some guidance on what would be the measures against potential problems. Also, how would one go about adding possible capacitors or forming the often-recommended star ground when the current could be above the capacity of a good ol' stripboard?