They charge $1000 if you buy one of their pre selected properties.

The inefficiency of this system makes it risky to rent to tenants without stringent screening processes.Consequently, I have had to adopt extremely strict criteria when selecting tenants.

Here's an article with things to consider when selecting a cost segregation company.

I would recommend you really take your time selecting the right software.

AS we did this for a few decades in a few select counties you would see the same names and same parcels pop up only to be redeemed last minute as you note..

i do know one female investor in beach areas of Orange County that sometimes chooses to add ADU on her flips and does well, but she is not hands off and is selective where she adds the ADUs.  

I’ve also been creating what I think is a good foundation for finding and selecting positive cashflow RE Properties but I still need to understand some details to guarantee my calculations are correct and that I’m not missing or forgetting any important details that could make or break a deal.

This doesn’t mean that one can’t SELECTIVELY find “deals” that make sense.  

Here's an article with things to consider when selecting a cost segregation company.

And even there, ready options exist where persons "could" do it all for pennies on the dollar of this prevailing fee structure and still that vast majority select the prevailing structure of things.