This is usually covered in all rentals in PT. I've had one exception when I booked on Orbitz when CDW was excluded ...
O preço inclui:

• Imposto Local (IVA) << VAT
• Cobertura para Colisão (CDW) << obvious what this is
• Cobertura de Assistência Pessoal (PAI) <<< personal accident insurance
• Seguro de Responsabilidade Civil (LI) << third party liability insurance
• Proteção para Furto (TP) << against theft

As to the amounts - no clue, but they should be enough. The judicial system here is not known for being super fast or to hand down very high verdict amounts.