Hey Jobaco,
I have a bunch of extended family there in Portugal, only met them a couple of times though.
As for the sounds I would have to 'match the hatch' as pay attention to the surrounding environment, what sounds are the indigenous fox likely to hear at dinner time in your area. Might just be field mice, small birds, olive trees or the sound of growing cork? Ok the last two we might have to call Fox-Pro in for help with.
IMO just match whatever local prey they would eat in your area. My best guess would be small rodent sound or a distressed olive.
My uncle Bill offered to take me to Portugal (years ago) on his fishing vessel, huge 109 foot ship. I wish I would have went, he said from Gloucester Mass to Portugal and back he would still have a half tank….lol
Good luck
Bill