I will also add, since I just thought of it, that some people will tell you lots of things about away rotations such as:
You have to go to a county-like program to get interviews at county-like programs.
You have to go to academic places to get academic places.
You have to go to California to have a chance there.
I will tell you that if your scores are high enough, none of those are true. If your scores are average or below average, those things will only help.
It is always better to get one smoking SLOR than two average ones, etc. However, most places want you to get at least one away rotation (if you are an average student), because most home institutions will write you a good letter regardless of the kind of student you are. It is those "outside eyes" phenomenon. Plus, you are pretty much assured an interview at the place you rotate.
Once again, though, the bane of my existence, if you have a 260+ Step I, you can in all actuality decide to apply to EM the day before you submit your ERAS, pound out a bland PS (that nobody cares about), and get one letter saying you like EM, and you'll get interviews. None of this guarantees a stop, but it helps you out.