Firstly are they leaking because the wind is strong causing them to spill? If the unit is leaking, can you return it to the place you purchased it from?
I have glass bottles, and they have never leaked. Previously I had some plastic ones, and in our sunlight, they eventually became brittle and cracked.
You don't want to be dripping sugar water, as that will attract the ants.
I'd try and return that and buy a glass one.
Good luck, I hope it works out for you.
Our hummingbird feeder has a dome, and yet the ants still get to the nectar. After reading your ideas, I came up with one of my own. I used red electrical tape. First, one rotation, sticky side down, as usual, followed by a half twist, then wrapped with a wire hanger, sticky side out. The ants don't like it, it cheap, no harmful effects to the ecosystem. How do you like my idea?
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