Guppy frys and 2 gupies dead

First, I like the way your tank looks with all the plant decorations. The cories will leave healthy fry alone so what you really need to do is protect the fry from the adult guppies. It would help if you had a separate tank to raise the fry until they are large enough not to look like food to the other guppies. If you don't have it you don't.
Next best option and you will be amazed at how many are saved by it is to get something, almost anything, that the fry can swim into and through easily where the adults cannot follow. In a nicely decorated tank like yours, I would look for something that looks like a dense stand of grass or an open looking moss. The idea is very small spaces your fry can fit right through. Now that you have seen them, you can guess pretty well how small a space they can fit through. The hiding place should be large enough for several fry to live in it for several days without being too crowded as that is exactly what they will need to do.
Another thing you can do when you see a female starting to give birth is get the lights off in the tank. You won't be able to watch the process easily but the adult fish won't be able to spot their snacks as easily either. It won't stop the predation but it will help some.

I have a 10G I let my platys give birth in...no traps. just a big wad o' java moss and a load of dense hornwort in there. The newborns usually hide in the java moss and venture out as they get bigger.