shelving - What's the best way to mount a shelf below existing

We've raised all the cabinets in our kitchen all the way to the ceiling, and the plan is to build an open shelf to hang beneath it. Like so: I'm trying to decide what the best way to approach

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Budget Friendly Faux White Oak Floating Shelves

These two wood shelves are both 7.87 inches wide, 31.5 inches long, which are wider and longer than the ordinary shelves on the market.With spacious area of these solid and durable wall shelf for bedroom, you can place stationery or various household items without worrying about damage.Enhanced bracket design of these wood floating shelves provides the capacity to firmly support the items up to 40lbs.

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