Transfer of savings

Hello.
Moved at the beginning of this year for work. There is an account with ABN AMRO. Received a roll from the employer. I learned that in the third boxing I can act as a non-resident taxpayer, that is, I must not declare accounts and income outside the Netherlands. https://www.belastingdienst.nl/wps/wcm/connect/bldcontentnl/belastingdienst/prive/internationaal/internationale-belastingregels/wonen-buiten-nederland-nederlands-inkomen/wonen-buiten-nederland-nederlands-inkomen
In addition, I learned that there is a tax-free allowance for 30846 euros of savings for residents.
I have savings of 50000 and plan to buy real estate in a few years with a mortgage. My main question is how to transfer money here correctly so as to bother the bank less with confirmation of origin and how difficult is this to do? What is the usual procedure? What do they require and what is enough? What's the best way to pay less taxes on this? Is it better to transfer in the first year of my arrival? Then I will need to declare them anyway and pay the difference between the amount and 30846, despite the benefits of ruling? Or is there no point in transferring in the first year, as needed, then transfer?