did this kind of thing on my last car.
Under the seats sounds like a good idea but there is no room at all.
If you put the lights there you wont get the "glow" you are looking for at all.
Put them under the dash.
You can easily make brackets to hold the LED strip up under the dash and point them down at the floor. The whole floor area will glow the color you are looking for and you cant tell if its coming from the dash, or under seats.
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09 370Z Black Sport/Touring/Navi
Red Stitching
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