A similar thing was done in F1 in 1978: https://en.wikipedia.org/wiki/Brabham_BT46
It was swiftly banned of course, since it worked too well.
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Or not well enough?
These cars would appear to be utterly dependent on maintaining a very specific distance from the track for the ability to stay grounded. You imagine going into a curve at high speed and the slightest body roll or debris on the track that might kick the car up an inch or so would break the suction and send the car flipping like a pancake.
Something like that happened in the 1999 Le Mans to Mercedes[0]. It happened three times that race weekend before they decided to retire their last remaining car.
That is an issue with all ground-effect cars, not specific to fan cars, which is why they were banned, but that happened much later. The fan car was banned because it gave Brabham an unfair advantage and the other teams didn't like it.