Usually there’s one mic pointed at the twelfth-fret and one behind/below the bridge. The one on the neck will give you clarity, the one at the bridge a more focused midrange.
Another way is using the mics in a x/y setting a few feet away from the guitar. This usually gives a nice stereo image but does require a decent sounding room.
To save sample editing time you could record yourself noodling using different mic techniques and then pick the one you like for the sample session.
If you plan to sample over multiple days remember to take pictures and measure the placement of your mics.