What a management fee structure looks like when the owner wants 8 percent flat

A common scenario for anyone running management on scattered SFR: an owner pushes back hard on the fee schedule and wants 8 percent flat, no leasing fee, no renewal fee, no markup on maintenance coordination. The owner's argument is that ATTOM style yield compression means the numbers do not work at 10 percent plus a full month leasing commission, and on the numbers the owner is right. Gross is $2,150 on a house that cost $340,000. The real question is whether the 8 percent flat model is survivable on scattered single family. Cost per door on turns is what kills a manager. A vacancy on a detached house with a yard means landscaping, a full paint, and three or four trips that a stacked duplex would never need. The leasing fee is where that labor gets recovered. Has anyone priced a genuinely flat fee scattered SFR book and made it work at scale, or does it only work if the manager is also taking the maintenance margin? And when an owner moves from percentage plus leasing to flat, does the relationship improve or does the argument simply move to which repairs get approved?