Indoor kfigerm tries his best

[The Iconoclast]

If it's leca/hydroton/etc., It won't hold much liquid and remains fairly light. Any weight will be liquid in the tray and of course the plant itself.

I've never done flood&drain so I'm not sure about this, but flood table drains and valves might work for your situation? They're pretty cheap.

While it does become flood and drain, my intention is to just flood and have the plant do the draining like an auto-pot. I got a delivery of glass straws to check the level.