No VPN required.
You will need to set up a new US account if you don't already have one. A US address (any Maccas will do) plus US credit card is required. I was able to use Credit card generator(card-generator.com) to get CC details which Amazon accepted.
Have randomly tested watching some of the episodes on a laptop and they are working. Haven't tried watching on a mobile device yet.
Attack on Titan - Season 1(amazon.com)
Black Clover - Season 1(amazon.com)
My Hero Academia Uncut - Season 1(amazon.com)
High School DxD: Season 1(amazon.com)
Full credit to Dealabs(dealabs.com)
Thanks for post and tips on getting american CC!!