I think that sometimes we get a little picky about what things are called. The OP ask for the location of THE SWITCH that SUPPLIES power to the booster. He did not call the switch a booster.
Isn't in fact a booster an amplifier, if it increases the performance isn't it boosting the performance?
How many of you use cotter pins? Isn't the correct name a Cotter Key?
Come on lets not use that tired old phrase, "here we go again", accept the intent and help the guy out.