Down through the years I have had good luck with putting a thin layer of milled sphagnum moss on the top soil of the potting container to prevent damping off. I just take a bit, rub it between my fingers to crumble more or less, and let it fall wherever it falls on the potting soil and forget it.
I think i’ll try that. Can’t hurt. I lost a whole tray of cherry tomato seedlings last year. That hurt my feelings! And my pocketbook.