It could be blocked sunroof drains. The wind traps/knuckles in the corner of the windscreen become blocked due to the end of them being almost crimped shut.
My progress thread in my signature has a guide on what I did to fix the issue.
You might not see any water marks, possibly some where the A pillar trim meets the headlining.
When the wind traps are blocked, this is where the water backs up to, then runs down the A pillar and into the foot wells.
It could also be a blocked A/C drain. This is located where your left foot is whilst driving, under the carpet.
The floor pan is quite open, so water from the front can easily travel to the rear foot wells.
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