In order to contribute a guide on installing with Proxmox VE Helper Scripts, you should open a pull request that adds the guide to the USER_SUBMITTED_GUIDES.md file.
Installing Home Assistant OS using Proxmox 7
How To Separate Zigbee2MQTT From Home Assistant In Proxmox
How To Install Home Assistant On Proxmox: The Easy Way
Home Assistant: Installing InfluxDB (LXC)
Home Assistant: Proxmox Quick Start Guide
Home Assistant: Installing Grafana (LXC) with Let’s Encrypt SSL