You’re Welcome Adam,
And welcome to the Char-Griller family. I usually place the pans on top of the charcoal tray (I leave the charcoal tray at it’s lowest position during smoking). The water helps maintain a constant temp and keep the food moist. This is optional, if you’re smoking food that does not require much moisture, then omit the water.
Enjoy your new grill/smoker.
When we get to the winter months, I’ll share with you a trick that would maintain the temp in extreme cold.
Until then, let us enjoy the sunshine.