Not OP, but the vent covers install under the driver and passenger seat. There are vents to blow air onto the feet of people sitting in the 2nd row and those vents have no cover.

Taruimoo Backseat Air Vent Cover... https://www.amazon.com/dp/B0B4DBCWKY?ref=ppx_pop_mob_ap_share

I have a 23MYLR and got these. They attach like velcro on the carpet around the vent and stay put.

https://www.amazon.com/dp/B0B4DBCWKY?psc=1&ref=ppx_yo2ov_dt_b_product_details