I love these guys, though they don’t fit your wall mounted criteria.
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You could rig something up to hold them I’m sure. I use mine all the time to speed drying and lots of other things where you just need a quick fan, they’re surprisingly powerful. I like the battery powered feature, though you can use them plugged in via any usb power source too.
The little clip they show holding it to a shelf – if you point it straight down, 90 degrees, does that still hold it there well? The shelf is less than half as deep as the table, so that’d actually blow straight down on the drying paint.
I have some similar to that that come with the bendable silicone holders (I am blanking on what I want to call them - flexible tripod maybe?) that you can twist around many things, I wonder if that would be helpful at all? Just throwing that out there in case.