Wild Wings WWSFHF5 So Real Single Flower Hummingbird Feeder, Red/Yellow (2-Pack)

How do the hummingbirds eat from these when they are half or 3/4 full? How is it possible for them to drink from the space between lid

Does it do a good job of keeping ants and pests out? And do the hummers like it?

Mine leaked badly, bad angle for hummers to reach nectar so how do they use it?

How does the perch go on the flower? If I place it under the flower firs, the flower won't close properly. I don't know how to do it with the flower o