I've looked into soundproofing matting to attach to the ceiling, then the Z channels and another layer of drywall, but I wondered if anyone else has dealt with this.

I also think that BP itself unintentionally feeds into this idea.

You certainly want to be on traditional booking channels such as Airbnb, Booking.com & VRBO.

A lot of the people that built big portfolios quickly - and then wrote books or built YouTube channels - can lose them just as quickly when they realize they don't know how to manage what they've got, a loan gets called due, or whatever.I recommend you network with other investors and spend time with people that have more than ten years experience and that did it by saving and investing wisely.

Understanding cash cycles from different marketing channels will give you a better understanding of which path will be best for you to pursue.Outbound channels are getting more and more regulated as days pass, so I recommend diversifying with different marketing channels so that when one gets shut down, your business doesn't suffer significantly.

Curious on if anyone is using marketing channels outside of the normal ones like direct mail, PPC, PPL, cold calling etc.

The OTAs are biting the hands that feed them as food (money) is getting scarce.

I have a very helpful video on my YT channel (just lookup ClosedByMo) for NYC househackers - you'll enjoy it! 

Some of the big names are Lamar, Clear Channel Outdoor, Outfront Media, Adams Outdoor.

In all likelihood, what you are proposing is buying a cash-sucking (ie - negative cash-flow) property where you have to feed it cash each month you own it.