The predicate for extreme asset protection measures comes from state law. MD is bad compared to Ohio where piercing the corporate veil is a myth - applicable only where the owner (even 100%) has committed a crime or fraud. Maryland has more likely (but still long shot) criteria.
But, it is not safe to assume you won't be sued since the US has about 30 million civil lawsuits pending as I type this.
And, it is against public policy to insure intentional torts. So when you hire that able handyman and give him keys to all of the apartments and the security codes without learning that he is 90 days out of prison for breaking and entering and committing assault and kidnapping your umbrella coverage may not help.
And, these days, a million dollars of coverage will deal with the contents of a small truck that you sideswipe and it bounces around a little with the electronics inside. A serious accident with injured person requiring hospitalization can get to a million dollars in a month or two of medical care.
Hence the efforts by asset protection specialists.
For my part, I just use the LLC approach. One for each property and really good records.