Where it goes on stage
Stage position is the thing that gets argued about at load in, so it is worth drawing accurately. Guitar positions sit downstage of the backline they use, angled in toward the drummer so the player can hold time by eye as well as by ear. If the room forces a compromise, move the icon and export again. A fresh PDF is cheap; an argument at load in is not.
What the crew needs to know
One thing worth writing down. State whether guitars run through amps or straight to a DI. That single line decides roughly half the channel list.
On the input list
Rack Mounted Gtr produces one channel on the input list, defaulting to a Dynamic input, a boom stand and phantom power off. It sorts at position 4 in the drums first, vocals last channel order that front of house engineers expect. Change any of it per plot; the default just means you rarely have to.
Console exports
Channel names travel with the plot. Export a scene file for an X32, M32, or Wing, or a channel name CSV for dLive, Avantis, SQ, DiGiCo, and Yamaha CL and QL. See the console guides.