Thanks for the heads-up! I wasn't aware that they can be made placeable without losing backwards compatibility – turns out they can, and I've just fixed and reuploaded them. OfB users, please redownload. You may or may not need to re-buy the objects to make them understand that they're now placeable, I didn't test that.

See the attached screenshot for how they will be placed; note that the small watering can may look weird when shelved because it does not sit in the middle of a tile. You may need to rotate it to make it end up on the shelf, rather than in mid-air next to it.