For context, I have $80k in liquidity and $1m in equity in my primary residence so working on opening a HELOC and plan to add multiple properties each year through the BRRRRR method.

Once you decide which type of exchange you want to do, you could then narrow down your product / company. 

Yes there are products that can up to 80% LTV for DSCR with 6 months reserves.

Are there lenders that will lend on the product at competitive rates that are similar to current 30 yr sfh amortization?

I would be curious if you e-mailed your city, county and state officials with your story how they justify you having to pay property taxes.

And like any big money making business maybe 1 out 25 or so does anything that could be deemed successful the others just sell their books and tapes on E bay for 50 bucks.

This can help you greatly with the additional depreciation.Ultimately, med to large MF and small 2-4s are totally different products. 

Great tools that get updated regularly.I am on the lending side of things and would be happy to hop on a call with you anytime to discuss financial strategies and help answer any questions you may have about nearly any loan product available to help you on your journey, even if they are not products my capital partners offer.We are all here to help you learn and grow.

I think the product is absolutely amazing for investors!

Quote from @Derrick E.: To answer one of your questions, I doubt you will ever find someone willing to give a loan in 2nd position on an investment property.