Rank only those programs where you are able and would be happy to train. Putting a program on your ROL creates a binding commitment if a match occurs, so review carefully each program’s eligibility requirements and the contract you will be expected to sign. You should receive that information from programs during the application/interview process.
Do not rank programs where you did not interview. Programs do not rank candidates they have not interviewed, and no match will occur.
The matching algorithm attempts to place you in the most preferred program possible, so be sure to rank programs in order of your true preference and not where you think you will match.