An addendum is sufficient.

The reality is that the vast majority of agents 80%) is very inexperienced and the top agents don't want to work on a house hack, they chase luxury listings.

Can you afford the downpayment, brrr costs, keep money in the deal and have sufficient reserves for both properties(i.e 2 years of vacancy/lead times, 75-100% of capex, 3-6 months of random ********?

do you think 1 Gbps is needed or is 500 Mbps sufficient?

Your existing REI background will be sufficient for any lender.  

Having contingency plans and sufficient cash reserves is crucial for navigating unforeseen challenges.Hope this helps!

or is email sufficient?

The vast majority of lawsuits against Landlords are for wrongful eviction, security deposit disputes, and Fair Housing Violations.

What I mean is if it's already a rental with most of the basics in place, it shouldn't matter if you spend 3k or 25k, if it cash flows sufficiently.

I think many people have sufficiently answered your question, but here's an article that you may find helpful regarding STRs to determine if this is a strategy you are interested in.