Need a little advice....
This is my first year attempting to start seeds for transplanting later in the raised beds. I bought a 50 pack of 3 inch net cups. The seedlings are doing fine, and I have started bringing them outside during the day. My question, if it rains outside and the storage bin lid fills up with 1 inch of water, will it drown out my plants in the net cups? I think I would be in real trouble if I used regular pots with solid walls, but will the slots in the net cups prevent the roots from drowning because they have so much access to air all around the cup?
FYI, I am using these Hefty Hi Rise 72qt storage bins as mini greenhouses. I turn the bin upside down, using the lid as the tray to hold the plants and the clear bin becomes the greenhouse if needed. However, like today, I just let the plants stay outside without the top on. If it rains and the lid fills up with as much as 1-1/2 inches before it overflows, will it drown out the plants in the net cups?
FWIW, I have been bottom watering the plants by putting 1/4 to 1/2 inch of water in the lid, allowing the net cups to soak up the water over a day or two. Then I wait for a few days until I see the top of the net cups drying out. Then I bottom water again in a day or two. It seems to work for me. But I have seen other people recommending that all water not absorbed by the net cup's potting soil should be removed after 20 minutes.

I really don't know what is best. It seems to me that the net cups with all those slots are just different than pots with solid walls and I don't know if the net cups are as prone to overwatering. Anyways, that's my concern and my questions. Thanks for any help in advance.