@James Folsom First, congratulations on taking the big step towards being a RE investor!
My father has owned SFHs in Cincinnati for 20 years, mostly on the west side of Cincinnati. One thing to be wary of is turnover costs. In single family homes, especially in the C- through B- category, your turnover costs for a large SFH is likely going to be more than a security deposit would cover, unless you're doing the lionshare of the work yourself.
Also, the city of Cincinnati is raising the cost of water/sewer by 7% or something crazy like that, so I'd be interested to see how that is going to effect rents.
I'm assuming this is an older home? Plaster walls, perhaps? Become a real pro at learner how to patch plaster because that stuff cracks and crumbles like none other in the SFH world.
Also, I know Norwood is slightly better than the western neighborhoods like Price Hill and Westwood, but your numbers seem low for a SFH. My father's SFHs, at around $70,000, would be a 10%-12% Cap Rate with 25%-30% CoC. I'd be curious to know what the standard is for the east side.
As far as the entity is concerned, the preferred method is to make an individual LLC for each property, but to your point, this can be a real hassle. What you outlined (having one entity and an umbrella policy) is what my father has done and it's worked well.
Hope this all helps! Feel free to reach out with any questions. If you have any interested in learning about SFH on the west side, let me know!