You either need a "Add-a-circuit" for Low Profile mini fuse. I am assuming that'a what your RAV4 uses.
Or I simply took the fuse that I wanted to use and soldered a wire to it and then crimped my circuit to it.
If your RAV4 fuses are like mine, you already have an un-used slot for SEAT HTR in the fuse box under the steering wheel. I believe the OEM use is 20A but maybe I am wrong.