Replacement Shelf Brackets for BAMFOX floating shelf

I picked up a shelf instead of making my own shelf to put an air purifier on it in my 3D printing lab. The shelf indicated to be able to support 20lb, the air purifier is 12lbs. I put up the shelf, and I did not feel comfortable with the brackets it came with as they were flexing significantly under the weight of the air purifier. So I made replacement shelf brackets. Now the shelf is very secure.

This is the shelf it will match: https://www.amazon.com/gp/product/B07VYGD6JH/ref=ppx_yo_dt_b_asin_title_o05_s01?ie=UTF8&psc=1