Does your tank have water in it? If not I would drill it as it is way easier and cheaper. But yes you could use 2 seperate but then you might get two seperate drain flow amounts. If your sump has 2 drain inputs does not mean you have to use both.
Ok thank you I thought about drilling it but I still don't understand how that works. I know some people drill the bottom and some the back. What's the difference? Is there a website that will explain?