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I have sth like a waterproof fabric tray, but it looks better as a cover.

Yeah that's the drip guard... Lol but best have a tray and have it drain to a tank and pump It back up. My constant flow and drain was low tech cheap and perfect for once a day checks and every 2 weeks change. Besides a timer and set it for 5 mins on for every hour? Perfect hydro every time.

I'm running dry/wet cycle, so I'd have to hook up a humidity detector that'd trigger the drip... too much work for a small tent I think :)

Makes watering individuality a thing of the past. And small or big if they get too much it drains off. But the nutrients are constantly replaced.