Is PMI required?

It will require less down. 

You can also do this with FHA products and their low down payment options, compared to investor loans for a non owner-occupied investment that may require 25% down.

Hello, I would like to find out from the investors with medium to large portfolios of rental properties (preferably 10 units and higher) if they use any home warranty or service contract for property maintenance.

Even after moving out after the mandatory primary residence requirement.

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

Have you looked into the state requirements to manage properties you do NOT own?

PM me and I can email you a laundry list of exactly what we lenders require when doing a bridge loan for a real estate investor.

This would generate $350K that goes into your 1031 with the requirement to use that $350K to purchase at least $500K of real estate. 

The only lenders that can use AirDNA for rural STRs will require 30% down, so I would suggest either partnering with someone or saving up more for a down payment.