Tax Free Refund

Hi Sir,

I will fly to Bratislava on Saturday and the return will be via Bratislava again. I'm planning to buy an iPhone 14 when I move from Bratislava to Prague. When I use Global Blue office to do tax free, do they charge commissions other than general tax deduction? If they do, should I go directly to the iPhone website, enter the website with the Czech Republic extension, create a pre-order, and then send the necessary documents to the iPhone vat.refunds@apple.com e-mail address and request tax free? Does anyone have any suggestions on this? I do not want to pay commissions to brokerage firms!

Thank you.