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

How to Install Floating Shelves - Bob Vila

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.

31.5 in. Large Floating Shelves Wood for Wall, Set of 2-Wider Floating Wall Shelves for Wall Decor

How to Add Extra Shelves to Kitchen Cabinets - H2OBungalow

How to install inexpensive, energy-efficient under-cabinet lighting

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Heavy Duty Floating Shelf Brackets - Stud Mounted Support Bracket

Cheap and Easy DIY Closet Shelves - The Handyman's Daughter

How to Put up Shelves: 12 Steps (with Pictures) - wikiHow

Cheap and Easy DIY Closet Shelves - The Handyman's Daughter