We noticed that many options suggest to use wall anchors. Lots of the customer reviews on the products mentioned upgrading those anchors to add more stability.
When using heavier items on the shelves this can help secure and protect the wall and the shelves from any damages.
All of these are top rated products, so we do like many features of each. However, we like the Bleecker Station Wood Shelves. They seem to be more of a permanent solution, which may be good or bad depending on your ultimate goal. Also check out the Del Hutson shelves if you are looking for a longer shelf. They have a 36″ version to consider.
Nonetheless, these seem sturdy and relatively easy to install. Check out the DIY video included to make and assemble your own floating shelves too.