My seedlings sit in water every day, on heat mats with lights. I don't know if I'm doing it "right" but my plants look amazing.
I wouldn't worry at all about water filling up the bottom tray, but that's just one opinion.
My pots are 3 inches high for reference in this photo.
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Thanks for the reply. Like I said, I'm just learning a lot this first year of growing seedlings to transplant.

I'm not at that point, by any means. This is supposed to be the last home for Dear Wife and myself. My concern is not the Air B'n'B guests themselves, but rather the increased traffic in our small neighborhood and just not knowing who should be here, or not. It's a change I was unprepared for and have not welcomed, regarding all the increased traffic of unknown people in our small neighborhood.

