When do I line up my property manager?

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Hi,
I believe I'm in the final stages of making an offer on my first investment property. One of the things I'm not quite sure about is when do I line up the property management company? Should I be talking to them now - even before making the offer? Do you sign a contract with them now that gets them engaged the day I close on the property? Any advice on dealing withe PMs would be great.

Thanks!