I was wondering the same thing for my liftback, turned out there are different spoilers for compact and liftback, apparently the only one that will fit liftback is one like this on picture below or similar with brake light, I assume you'd need to drill holes in the tailgate.
Installing spoiler in a E110 Corolla
in Corolla / Corolla Sportivo Club
Posted
I was wondering the same thing for my liftback, turned out there are different spoilers for compact and liftback, apparently the only one that will fit liftback is one like this on picture below or similar with brake light, I assume you'd need to drill holes in the tailgate.