Hi @Juan Pereira,
I haven't house hacked myself, but a long time ago I was listening to a BP podcast where the hosts were saying that one of their biggest recommendations when house hacking was to NOT let your neighbor/tenant know that you're the owner of the property. It stuck with me because it made so much sense. Essentially, they said that if your tenant knows you're the owner and you make a decision they don't like (like not allowing pets, commenting on noise/visitors, not fixing something to their standards, etc.) then you are to blame and you personally are the bad landlord. However, if you act as the property manager for the owner, then those decisions can't be blamed on you personally, because you're just the messenger! In addition, it may alleviate the tenant from calling/coming by at all hours of the day if they think you're the PM and working certain hours vs. the landlord that can be bothered at any time of the day.
If you decide to hire a property manager, that will remove you completely from the equation and could end up being easier for everyone, as well as reduce liability on your end. However, if you decide to self manage, then I'd absolutely recommend that you say you're just the PM. This will allow you more time to make decisions while you "discuss it with the owner" along with taking any blame off of you!
For your second question, I'm sure you could house hack two different properties in two different locations, but I'm not up to speed on the lending requirements. However, if you are gone from either location, or both locations quite a bit, I'd recommend hiring a PM in the location you won't be at as much, or possibly both. In my experience, it's been well worth the money!
Good luck!