...which transmission do you have in your '07 Malibu? The current 6T40 (RPO: MH8) didn't come out until 2008 in the Malibu.
...quickest answer is ask your dealership if the transmission in your Malibu has "input pump" only...which means the lubricating trans fluid stops moving when the input (from torque converter) shaft stops...meaning no-fluid flow = no lubrication = things can fail.
...as a "general" statement only--if the car has to be dolly-towed, because the FWD wheels shouldn't be rotating while towed, the transmission should not be coasted-in-neutral for either long distances or at high speeds.
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