Wiring 12V from battery to front seats

Hello, I'm planning on placing a new audio system into my Aveo. Does anyone know of a spot where I can run my 12V cable from the battery to my amp (Im placing it under the front passenger seat to save place in the trunk)? I was trying to find screwed in sealings at the front legrooms - I think I actually did, but I couldn't find them from the engine bay to actually remove one of them. It's a European 2006 - 2011 sedan with manual transmission.
Thanks in advance. :)