I know it depends upon where we are located but I was hoping to put some numbers in my analysis.For instance, I have assumed that it will cost me $1,000 to add each meter plus any required internal plumbing/wiring to get everything run correctly.

You are correct. 

If you buy correctly (right numbers, do a good job renovating, and use a good PM company), you won't have any trouble renting out your property at all.

Yes, you are correct. 

Someone else correct me if I’m wrong.

For example, they include property amenities in the description instead of assigning the correct boolean value.

Keeping them separate is for better bookkeeping, managing the numbers, and when you sell or refinance.The disadvantage is that it will cost you more to have separate LLCs, and it may be more of your time to track.But if the goal is to buy more properties, build the foundation correctly.

If cities had people actually budgeting correctly, maybe we could stop raising the rents every year.

It's causing an up wave of price increases here.

From my understanding if 75% of rents cashflow over PITI it actually improves you DTI for approval is this correct assuming have 2 years landlord experience?