I stick them in rapid rooters, it's super rare that one doesn't root, like 1 in 500 or so.
When I needed 200 every 20 days I used a 2x4 flood and drain tray with a dome. Set the 4 rapid rooter trays in there (the insert that holds them), set it to flood with just water every 24 hours and set the depth to just halfway up the rooters. I only visited that house once a week so it was automatic.