@Bob Stevens Good question.
I'd prefer not to be involved.
However, my experience with 30+ doors is that we end up paying 14.88% of gross rent to property managers. The 8-10% base fee + lease up fees, renewal fees, project management fees, oversight fees on repairs/maint., tenant placement fees, etc. When professionally managed, our repairs/maint. expense line item tends to be 8-15% of gross rents whereas self-managed properties we're closer to 1-6% of gross rents. This isn't because I'm cheap or am a slumlord. I review the estimates and get comparable quotes when the estimates are high rather than blindly signing off as a property manager. I put in quality fixtures/systems and once a tenant is settled, there are rarely repairs. My vacancy is far lower when I self-manage (2 weeks on average) compared to managed properties are over 30 days in the same markets.
Unfortunately, it's just worked out to be a better business model to self-manage and hire a book keeper and assistant to help with the admin overhead. For showings, I work with Realtors looking to make extra money as it's pretty easy to show and lease our properties. We just need a trusted partner to do the showings. I'm not a big fan of the Rently / self-showing options and rather pay someone to give prospective tenants a tour / answer questions / etc.