Also, the offerer wanted me to use their preferred lender who couldn't approve me even when I had a pre-approval for significantly higher amount from another lender, we wasted 2 weeks with the offerer's preferred lender.

House Hacking is a great way to minimize expenses, obtain property for very low money down, and learn the ins and outs of property management.

Both of these loans will normally require 20% down.If you are concerned about your primary rates, you could use an FHA loan to purchase with minimal down, live in the new property for 12 months, then refinance it or rent it out. 

My main fear with sharing my GC and subs is that the owners or investors who ask me for their information will be a waste of their time and look bad on me.

If I’m buying properties for long term buy and hold, and am buying quality properties with minimal/no rehab, and with little/no cashflow (buying for long term loan pay down, equity, and tax benefits), is it hard to get multiple mortgages?

ADUs where there are minimal comps and obviously an ADU are sometimes far below the hands of cost.  

I agree with others to not take any action on the posts since you'll likely be wasting time and energy.

It doesn't exist, don't waste your time thinking about it.

In TX, the SoS fee to register an LLC is $300 +/- rush fees, name search fees, and card processing.I'm sure many agree that spending much time on setting up business entities is a waste of time (noise). 

Starting out, you're going to want to minimize those detracting factors.