It should be pretty accurate - high level data sites are not always going to be perfect, but should always be directionally correct and AirDNA has a pretty strong track record. 

Whether you need a CPA with just three rentals depends on the complexity of your situation and your comfort level with DIY tax prep.If things are pretty straightforward, you might be fine with tax software for now.

We understand that not every negative item we dispute will come off.We persist until we succeed because you must have a high-level of doggedness as a real estate entrepreneur.We understand there will be sunk costs and time being wasted.

There aren’t many residential development companies operating at this level, which reduces competition and risk.

And you get feedback at a level high enough to determine how to proceed. 

It also requires gaining a level of sophistication and knowledge that not everyone has the time, inclination or ability to do.

We also disallow Level 1 sex offenders to the extent we are legally allowed to.

@Chris Kay it depends what level of renovation you are doing!

I've used Propstream, Red X and Real Estate skip trace with varying levels of information accuracy.

You should not get a PM until you have scaled to a level that requires it.