The owner you want is not shopping this week and does not call himself a landlord
Recognition is the product. An account that promises owner inquiries next month is describing paid search under a different name.
Owners move on their own schedule. Something goes wrong, they sit with it through a lease term, they ask two people they trust, and only then do they call. The window where you can influence that is months wide and nowhere near the week you posted.
Most of them would not type the word landlord into anything. They think of themselves as somebody who owns a house they used to live in, or who inherited a duplex, or who bought a rental as a retirement plan. Write to that person and the language stops sounding like a trade brochure.
So the feed is doing recognition work, not lead capture. Its measure of success is that your name arrives already familiar in the moment somebody finally asks a neighbor or an accountant who to use.
Say that out loud to whoever approves the budget before the first post goes up. A year is the honest unit of time here, and a firm that quits at month four paid the whole cost and collected none of the return.