Yes strip the door to dynamat if you want to sound proof.
Personally i'd check behind the scuttle panel before using the washer pipe grommet for a power cable. I think the Ibiza has the same grommets as the Fabia to route the power cable though (easily takes 4awg cable).
Take a look at the right hand side as you look at the engine bay.
Sure you'l find anything your after in the forum there, there used to be an ibiza install guide there (with pics), not sure if it's still there tho but worth a look.
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