I think what @Garrett Brown is getting at is using this in addition to other methods.

That trial period lets you see which method works best before scaling up.Moreover, the consistency and success of any agency largely depend on how well you follow up with your project manager and monitor the KPIs.

As landlords or property managers, what has been your experience with these two methods?

I have the money to buy now but I would rather do creative financing and use as little money as possible out of my own pocket. looking to start with BRRR method but maybe should start with a wholesale first to fund that?

What is your preferred method of contact and when is a good time? 

I am sure there are people who did it, even on this forum I saw posts by multiple users who claimed that they were successful doing this method.

The only two ways to rectify this are (1) purchase the property far below market price or (2) significantly increase the property net income usually through some method of “repositioning”. 

Another great option is the BRRRR method (Buy, Rehab, Rent, Refinance, Repeat), where you buy a fixer-upper, renovate it, rent it out, and refinance to pull your cash back for the next deal, and this is a good route because most private lenders can go higher LTV than on a rental loan! 

I've been following the build-to-rent method for some time and even lived in one for 2 years.

You have to have a method to develop a cash snowball.