I'd start with two on the floor and one ceiling mounted. If one or more of them never gets used you can take it out later.
Unsolicited advice, but if ever possible I'd offer more height if you have the opportunity. I have four carpet pythons and I rarely see any of them on the cage floor. 4x2x1 will definitely work, and many of mine were in that size at one point. But after moving them to 18-24" tall enclosures with perches/shelves/skyhides I see a lot more activity out of them.
Varies by individual animal obviously, but of all four of mine I've seen them collectively use the floor hides on either side maybe 3x in the last year to year and a half. They're almost always up on a perch/shelf/sky hide/etc. Every one of mine favors their sky hide over any other hide.
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