i think you'll be around break even or maybe slightly positive at 8% interest (do you have numbers?) 

I'd like to start with flushing every few years and replacing the anode rod every 5 years or just once with one of these powered rods.I am skeptical of the very positive product reviews since the review really needs to be submitted 10+ years after the installation to be meaningful and they never are.

In a long-term context, May vacancy rate is 0.3 percentage points higher than the 3.8% average recorded since the beginning of Q2 2014.OutlookREIS' new construction analysts report that 12,219 units of new speculative apartment inventory will be introduced to the metro by the end of the year, and net total absorption will be positive 3,047 units.

If you want to put yourself in a position to have a quality PM I would recommend the following based on experienceGood PMs manage properties in good areas.  

With 9,000 of these positions offering salaries exceeding $100,000 annually, the influx of employees and their families is projected to drive up demand for housing significantly.

We had our escrow instructions to title telling them they can record when they can put us in second position.. so we were good there.. that was another title claim I made and got paid off.. turns out the bad guy new when our title company had their recording slot and recorded the deed of trust just ahead of us..

Any advice for the HELOC lender, who would allow to keep the existing loan, means will take 2nd position? 

There was one instance discussed in the forums with a syndicator called Norada (you can search the forums for that name) where they not only stopped paying dividends, but also converted everyone’s capital to an equity position - which is code for “We don’t plan to give your money back unless we can survive to eventually sell the building.”  

So far I am having little luck finding a provider for this, although I am positive that others have been able to successfully accomplish this.

That bubble will burst in a very legally challenging way for people who follow that bad advice.Second, you have to be in a position to handle a Due on Salecall.Third you have to be in a position to make every payment on time even if the property is sitting there vacant.You have to know why you are buying the property and what you are going to do with it to be cash positive without question.There are other things but that is a start.