What is ProxMox? I assume you are talking about Proxmox VE - and Proxmox VE is a full solutions, means it provides the installation of the OS with the virtualization and also the full management stack.
So no need to use other tools. Our upcoming API allows integration, so after release of 2.0 its up to the third party tools to integrate Proxmox VE hosts but I do not see any good reason for building a "second best" management gui for Proxmox VE.