I'm about to make two offers, one on a triplex with a 6% cap rate and one one a single-family that I want to use as my primary.

Check out this recent thread on LLC’s, it’s pretty eye-opening that of all the very experienced investors on here, with centuries of investing experience combined, the consensus was that LLC’s are not needed for most investors:  https://www.biggerpockets.com/forums/926/ Of course gurus will tell you that you need one before you even have a single property, because it makes them sound smart.

2) I have on single family home (rents for $2100/month) that needs a PM. 

Quote from @Nick Am: I own a rental property through a single member LLC (say LLC-A) and I am in process of purchasing another property under the same LLC-A.

That’s correct, a foreigner can buy property through a Mexican corporation, which is a great option for those investing in multiple properties or running a rental business.Key Points I'd like to add to your post:Setup Costs: $1,500–$3,000 USD.Ongoing Costs: $1,000–$2,000 USD/year for accounting and tax filings.Benefits: Allows tax deductions for expenses like maintenance, repairs, and management.Best for: Multiple properties or income-generating investments.For a single property for personal use, a fideicomiso is often simpler and more cost-effective due to its lower maintenance requirements and feesUltimately, choosing between a corporation and a fideicomiso comes down to your investment strategy.

Hard to give good advice without more info, but since You are single no kids it's hard to beat buying a single family fixer upper and living in it for two years and then selling for tax free profits....I'm a big fan of Waltham these days $.02 

., "I will buy at least one single-family home, duplex, triplex, or fourplex before the end of 2019") and then do it.

Purchase price: $174,000 Cash invested: $16,000 Bought a single-family home in spring of 2021.

This single-family residence spans approximately 4,250 square feet and features 5 bedrooms and 5 bathrooms.

I don't know a single broker who would allow an agent to wholesale while hanging their license at their firm.