Does anyone have any specific places which they get picked up more often?
Well, there's "picked up" and then there's "got a journal entry" - not, alas, the same thing!
Regarding release spots from which I've received more JEs: it varies, but these have worked pretty well for me:
"statue" releases: books left propped up on or near statues or sculptures - extra points if I can make the book match the theme of the artwork somehow!
Inside ATM booths (a protected spot where people have time to look at the books - may be less active as more people switch to card/phone e-payments over cash, though)
On top of gas pumps or on picnic tables (especially at interstate-highway rest stops)
But I've had catches from the least-promising locations imaginable, and have had other releases in colorful, themed, public spots that I was *sure* would result in JEs but (so far) have not, so you never know.
Do browse this forum for other ideas, and the Site Watch forum for examples of catches - some of those can provide great ideas for your own release spots, and it's fun to see books being caught even if they aren't yours!
Also: while I've had fewer JEs from releases at book-swap shelves, whether OBCZs or Little Free Libraries or other such locations, I still make use of them - they're safe spots to leave books, the books seem to disappear so presumably somebody's enjoying them, and the release notes on the hunting pages may draw people in. And once in a while I get a nice JE from one of those releases too...