He asked for my help or advice in how to get onboarded as a vendor for professional property managers so I thought I'd ask here.

I just had a guest like this. 

Redfin  zillow etc can help  example https://www.redfin.com/state/New-York/housing-market

What made you interested in investing in this type of deal?

I'm looking seriously into this strategy.

Definitely can help you if you’re in a pinch. 

but if you're only doing this to help catalyze your investment path somehow... it's probably not going to help that much.the best way to build a network is just to spend time with other investors. 

Understood that some of the stuff on the listing is their proprietary information but this results in us losing all the reviews. 

Hi Mohammad, glad to have you as a part of this awesome community!

There might be a product you can treat the line with to help slow the process down.