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It's different for every car or truck from the Lexus I've had over the years, so you're going to have to be more specific which one you are inquiring about e.g. In a 2013 RX, it just "hangs" on the carpeted side of the rear Cargo area... I moved mine down under the floor mat with the spare tire.
stick it to the sidewall of the trunk. Its lined with the material that velcro loves. I have mine propping open my amplifier cover so the amp can cool off faster and easier in the AZ heat