How to handle multi-sensor

Hi all, not a super hot topic or emergency, but I would like to get your opinion on the best practices of how to handle a sensor with multiple sub-sensors. I have an ESP8266 project I made that runs on batteries and reports the pool temperature, the air temp, humidity, and battery voltages every 30 mins to separate MQTT topics (no JSON involved).

I was going to have separate entities and sensors for each, but is there a “normal” way of doing like combining all those in a group? I don’t think I’ll be doing very many automations with it, just basically displaying it on a card.