So... Robin, who is still new to laying eggs, laid her first two in the nestbox. (It's to the left, near the front of the coop; not visible in this picture.) Then there were a couple in the run. She dropped one off the roost at night. And now she likes this spot, way in back at the far end of the coop.
I put a nestbox in the far left corner, before she actually laid today, thinking she might like that. Nope.
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I'm going to give her a couple days to decide the box is the better place. And then should I give in and move the box to her favorite spot there? She's laid 3 eggs there so far.
It's awkward to get to that spot, but I can lift out the roost/poop board. I even laid some boards on top of the shavings along that back wall to make it less enticing.