What are the pros and cons of each option?
I guess the rounded one means the diameter of the hole in the wall should be very big, while no difficult affixing is required on the shelf, you just drill a rounded hole on the shelf and that's it.
With rectangular, it's the opposite. You can drill two small holes in the walls to install the bracket, but the shelf need to fit both the rounded pin and the rectangular shape of the bracket.
Am I right? What are your thoughts? I'm looking for something easy and budget friendly. already have the shelves which require drilling.
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