You want a bank that:
1) caters to non-residents,
2) isn't part of a EU based group,
3) is large enough to 'be of concern to the Montenegrean authorities in case of 'troubles'.
The first two are Montenegrean owned, and have a 9% and 6%, market share, I would open an account at both banks, cost you approx 0,60 €, so that would be negligible. (you can open at the others also so to diversify your funds and see which one you feel most comfortable with).
Thank you very much @Milky Moon for the valuable information, for your time and effort!
I wonder if there will be a problem if I link a personal offshore account from the banks above with forex ecn brokers so to transfer funds both ways and withdraw funds with a debit card. What is your opinion ?
I suppose this is the case to use EMI like MisterTango (with darks or not you tell me) inbetween, meaning transfer funds from bank to EMI and then withdraw them anonymously ?