Name MQTT sensor

Very new to HA so this maybe a noob misunderstanding. I’ve setup an MQTT receiver to get data from an inverter. I’ve setup the configuration in a mqtt.yaml file using the new notation. How exactly do I name the sensor? i.e. on the homepage the info is in a “sensor” box. I’d like to call it the “inverter” box

sensor:
  - name: "Inverter Total Yeld"
    state_topic: "sbfspot_ggtron"
    unit_of_measurement: 'kWh'
    value_template: "{{ value_json.ETotal }}"
    icon: mdi:solar-power
  - name: "Inverter Today Yeld"
    state_topic: "sbfspot_ggtron"
    unit_of_measurement: 'kWh'
    value_template: "{{ value_json.EToday }}"
    icon: mdi:solar-power

I may not be understanding correctly your question, but the name of the sensor will be as you have defined it using name. In other words the name of the sensors as what HA calls an “entity” will be: sensor.inverter_total_yeld and sensor.inverter_today_yeld. I am not sure what your mean by “homepage”. May be helpful to provide a screenshot.

I think I need to group all the sensors together into a group…

With homepage you mean dashboard? You can add sensors manually to the dashboard. When just installing standard it adds availabe sensors to the dashboard. But you can customize with clicking the three dots in the upper right corner.