This year I obtained some high vented tops that fit the standard trays.
I am planning to use them as protection for some direct seeders in the ground.
I am thinking that if I put sticks through the vents, then they would be held down against the wind and the critters.
Also have some clear "hot caps" to place over plants. The bunnies here have voracious appetites.
The squirrels dig, and so do the magpies.