A professional rack is more than a metal box. Plan for:

1) Cabinet height (e.g. 22U) and depth for switches and UPS.
2) Horizontal PDU with enough Schuko or C13 outlets.
3) Patch panel + keystones for structured cabling.
4) Cable management panels and blanking plates for airflow.
5) Cage nuts and a front shelf for lightweight gear.

Our Pack Réseau groups these items so you can order a coherent kit instead of hunting part numbers one by one.