Home Assistant MQTT Voice Integration

I need to setup a VPS ready and Home Assistant. My next step is to add a rock-solid MQTT layer so I can trigger relay modules through voice commands issued from Amazon Alexa, Google Assistant, and Apple Siri... (Budget: ₹1500 - ₹12500 INR, Jobs: Android, Arduino, Automation, Documentation, Home Automation, Mobile App Development, MQTT, Troubleshooting, VoIP, VPS)