I can't answer; however convention is two solenoids in the circuit (master and start). In my build I only fitted a start solenoid, isolation switch on batter supply positive and most of my toggle switches are switch / circuit breakers and have 5 additional fuses in the circuit.
It's also like fuel systems and weather to fit a gascolator or not; I did and always would.
Cheers
PS how far off is the taxi runs and then flight?