No first of all, all this is plain tax fraud and nominee directors is not something you want to do with a legit business etc to create fake substance in another country. Nominees might be fine (in my opinion) if you want to just stay of the records for other reasons but to create fake substance with a legit business in one of the developed EU countries to evade taxes is a very dangerous fools game. With the recent UBO registers etc this is not going to fly anyways anymore most of the time.
Also there are strict rules to when
dividends from another countries company are tax free in PT like how much percentage you can hold, how much influence you can have on daily decisions, can you make autonomic decisions, how much compensation are you getting etc. It is not just substance but you kind of need to have no say in the company and just receive dividends because you happen to hold a few shares in it. Magic word again is -passive- income as in the income is created without your doing.
If you want to stay legit there aren't many possibilities in the EU that you can sleep safe at night with. Unless you are a multi national corp, have 7+ digit income i only really know of Malta and Cyprus. Do not confuse NHR, UK, Ireland etc with those two countries. The reason they work is they have entirely different local tax systems which make this work legally and fully open. In Malta that would be the full imputation system along with foreign income and important tax credit system and in Cyprus the low corporate tax rate and free dividends no matter where they come from and where you are.
Flights to those countries to most major airports in the EU are like 50-250 roundtrip btw and usually 2-4h. That should be peanuts when considering any of those schemes anyways. Always remember most of those schemes will cost you min. 5-8k more likely 8-10k a year (you will make errors, you will be ripped off here and there, need legal advice, laws change, translations, double company, minimum expat taxes etc) + the higher living costs, flights, contracts etc pp. Calculate that into your profits + the effective tax rate of those countries to see if any of that really makes sense.
Other possibilities might be low flat tax countries in the eastern EU. If you want to live there 183+ days is something you need to know