Tanks inc universal pump

so I ordered a tanks inc universal in tank pump for my duster now I realize how it sits up and will hit the trunk floor has anyone installed one of these without cutting the trunk floor? I'm thinking I'm going to have to make a drop down in the tank. I watched a video of the aero motive one installed in a swinger and they don't mention haveing to cut the floor but I don't see anyway over coming it sticking up, any help would Be great thanks. Also I am aware they make a tank for the car with a in tank pump but I already had a new tank and trying to save money