I also top water, figure that overwatering is a bigger risk with bottom water. Also it's messy/splashy at least the way I've seen it done at the farm.
Not ideal for indoors, for me the wobbly waiter.
Linda I got a little watering can from Dollarama which is great. It has a long spout and I can water everything individually without raising the lights.
I have had the lights down so far I couldn't get in, when I do that I have to make a space and move the tray out to water then put it back. That is, instead of raising the lights which would be much more of a hassle for me.