Rebyidd- again, provided that your “liked” people don’t correlate to a religion ethnicity etc.
Lior- if it’s not under a different exception, probably. You can probably require that the missionary not proselytize on or near premises. These things are hard to prove in court. Usually, “testers” are used to prove discrimination. In order to motivate anyone to send the expensive testers there would likely already be a significant situation. But who knows? Maybe you just gave all the numerous missionaries who are reading this a great idea!