You really need to talk to property managers or property owners in your exact area.
Those numbers swing BIG time between 100 year old homes with wood siding in key west or the great white north versus 5 year old stucco homes in Vegas. Then figure in condo versus home. Then figure in snow or not, tornados or not. Income tax or not, high or low property taxes, tile or asphalt shingles, basements and foundation types, etc etc...
Over the last 20 years with a dozen properties in Vegas my management is 8% (plus a few hundred here or there for renewals or tenant placement, but way under 9%.) my vacancy is WAAY under 2%, probably under 1%. My capex is WAAAAY WAAY under 2%, again, likely under 1%. Repairs/maintenance expenses are waaay under 1%.
My only out of state property is a townhome in MN. Over the last 7 years 0% vacancy, 0% management, <1% repairs, 0% capex. But the outside of the building isn’t my responsibility. I have 4 kitchen appliances, a water heater, furnace/ac. When you’re getting $35k in rent you could buy all new appliances every other year @ 5%.
Which brings up another thing. These are all percents of rent. Well, if you buy a $50,000 house that brings in $500/mo. You’re repairs are going to be 20% for the year if you buy a new fridge. (As opposed to 3% if the rent is $3,000). I can’t even imagine the percentages if you have to have a $7,000 new shingle roof installed on that $6k/year rental.
Ask around, you’ll find 90% of landlords are super friendly to new guys trying to get started. (Sorry, I’m old, new guys and gals? Ladies? Let’s go with Men & Women.)