I think it is the cab shape and not necessarily its placement. If you have a cab forward which is very streamlined, a lot of air will still be reaching the rear wing. However, if its an ugly upright brick, the airflow will be disrupted massively, so less air shall reach the rear wing. But, if the cab is too far forward, the airflow will have a chance to come back down and 'regroup', so airflow will still reach the rear. The ideal would then be a very tall, boxy, upright design mid mounted. In the case of the front wing, it creates a lot of front downforce, regroups, reaches the rear wing, creates rear downforce.
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