Realtor Relationship - What should it be for rentals?

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Hey everyone, I've been having conversations with realtors as I search for my first deal.  Some have said, "I need you to sign a six month agreement for me to represent you before I start sending you properties" others have just started sending me properties to consider.  Curious what relationship you have with your realtors to get a sense and set my own expectation.  Can you have more than 1 realtor searching for deals in the same city or is that inappropriate?  Please share your expertise and insights.  Thank you!