Do I sign with Realtor before pre-market privilege?

[Keaton Smith]

Hi all! Basic etiquette question, but if I am targeting a specific metro and am hoping to have realtor help in searching for deals, should I contact several good realtors in the area, let them know my niche and ask if they can keep an eye out for pre-market deals, and then sign with the realtor who brings an option to me, or should I only contact and work with one specific realtor and hope they find good pre-market deals?

Essentially, for pre-market hunting, should I wait to sign exclusive realtor contracts until a realtor finds a pre-market deal, or should I go with one realtor and hope they can find deals?

Thanks so much for the help, if you're willing!