I’d put a bit of straw down myself, but they’d probably be okay on rubber. They’ll almost certainly poo and pee and lie down on it, though, so the straw would help keep them clean as well as being a bit more comfortable.
I probably wouldn’t partition unless you are 4 million percent certain the partitions can’t possibly shift or fall. They won’t come to any harm with the whole area but they could be harmed if the pallets fell.
How exciting!

Pictures of the new members will be required