Depends on the cupboard and the floor underneath I suppose. You may cut a hole on the cupboard's floor for a "flush" fit, or have the safe sit inside the Cupboard and use a longer bolt/screw to go through the cupboard's floorboard. If you do cut the cupboard an oscillating tool would be handy, but make sure you can move the safe in there with ease, especially if you want to move it twice to mark then drill the floor underneath.
Last year I was in a similar situation and found it's quite difficult to put the safe inside an existing cupboard in my case. In the end I chose a spot, installed the safe on the floor then put a new cupboard on each side, fixed a panel with compact hinges to cover the front.
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