I'm in contact with the account rep and need 20 people that are ready to sign up to get the pricing.

While it would be a huge added bonus to find a CPA  you can grow with over time, the most important aspect is finding one who know their real estate taxes. 

Bonuses for potential for an ADU add on if the lot's big enough.

If my brother and I hypothetically invested in an income producing property together, would only one of us be able to claim material participation in order to allow us to use bonus depreciation to offset our active income?

Like others have suggested, refinance out of your FHA into conventional (added bonus if you can get rid of PMI).

If the driver is owning the job and has high numbers early on, he offers them an immediate bonus $1.25 - $1.50 per house.

My goal is to sign up with a brokerage where I can re-start my RE career and also work with other successful experienced agent/ investors.

Either a lot of people don't use Sparefoot, thus you will take a priority position on the internet if you sign up with them. 

Multifamily syndications have the added benefit of bonus depreciation, which can result in losses, a great tax advantage for investors who are high earners, reducing their overall tax basis. 

Comes out to about a 11.5% return on rate and mortgage pay down with any appreciation as a bonus.