2) would propstream be the best tool for this?

Recently some tools disappeared (not mine).  

With expert guidance, tailored training, and a supportive community that will align you with the tools you need to fast-track your success and avoid common pitfalls.

That's why my friend—who's a real estate investor—and I decided to develop our own tool.

PMLs exist, there's zillions of them, real estate investors work with them every day and PMLs fill a need and have a role to play as a specific tools for a specific situation.See if you can put a sharper point on your question.Mike Thanks for this Mike! 

The tools that are offered are exceptionally useful and user friendly.  

Use tools like Zillow, Rentometer, and local real estate listings to compare prices and rents.

If you’re considering handling tenant placement and rent collection yourself, there are tools like Zillow Rental Manager or Avail that can help streamline the process.

Maybe when you get over 5 you can start to look at management suites.VRBO and AirBNB have all the tools built in to manage.

I also practice as a Realtor because I enjoy it and it is extra income.So as an investor, your options are to get your RE license and have access to a lot of tools and do the research yourself (therefore you're paying with time, energy and a little money) or you work with a great realtor/investor in the specific market you're looking into.