I've not heard of Investor's Edge, but definitely look at the backgrounds (resumes/Linked In profiles) of the principals to see what they did in the past. 

I would not send a letter I would call or find someone on LinkedIn

Popup Meetup, LinkedIn, Facebook Groups and other online platforms can be helpful in this endeavor.

I can still find ways to connect with RE investors, for example through LinkedIn, but I want to make sure I can provide value first.

Cross reference with employers with higher education off linkedin (use an API), and see if there's a correlation between housing prices in districts which are being gentrified, school ratings over that time period, and housing prices (in fact maybe there's another correlation between if these employers work for recently IPO'd companies and are exercising fresh options to purchase real estate).

I have 15,000 + mortgage broker contacts on LinkedIn, and 13,000 have agreed to receiving our monthly newsletter.  3.

Thanks Andrew, I just added you on LinkedIn - I'll send you the link 👍

Figure out the best medium in which you meet these folks (in person, LinkedIn, networking groups etc)4.

Find Justin Bogard on linkedin.

If you are interested in the underwriting process and financial model for multifamily, I recently published an article on LinkedIn that breaks down the end-to-end process that we follow to determine the purchase price range for properties.