@Daniel Luedtke you will hear different processes on BP, such as having them fill out an application before the showing or have them fill out an application at the showing, but I would recommend pre-screening them with some set questions before you even get to the application or showing. These could include letting them know your requirements (credit score, prior evictions, etc.) and asking about his or her current situation. This could be by email or phone. This will cut down on those applicants that aren't qualified.
I would recommend having them complete an application first and only then if they meet your requirements and seem like a qualified person then request the background check. SmartMove can be used for the screening, but you will need a separate application as SmartMove doesn't provide that. That way only the potential candidates are having to pay for the screening.
Check out this forum as it has a good process for pre-screening:
https://www.biggerpockets.com/forums/52/topics/476093-how-we-screened-300-tenants-with-zero-phone-calls-for-free