server or computer exhaust fan bracket

My servers were having issues getting all the heat out of the back because of my configuration. I used these brackets and the fans linked below to solve the issue. I put a small USB hub inside the server and plugged the fans into it.

Fans I used: https://www.amazon.com/gp/product/B07TCZG479/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

I used the 60x15mm fans.