Try EAS, I have connected to them and I am very happy about their approach and services . I have spoken to all the three , so my experience is:
-
Crossborderit is much more expensive and they have little idea about the Shopify settings and complicated VAT situations (we sell both from EU and deliver to EU from outside EU).
-
Eurora is expensive and they gave me wrong advice on sales via channels. They also will not support the installation and have a monthly fee of 50 EUR
-
EAS fully supported us during installation , helped with tax settings and location settings. All was done within 2 days from my application. They are the least expensive solution - no monthly payments and only 1.25 EUR per transaction