What are the recommended options for applying for a non-immigrant ED Visa for a non-paid internship in Thailand from a neighboring country?

Hi all,

I am doing a non-paid internship from June on and need to apply for a non-immigrant ED Visa in a neighboring country of TH. Any experience or recommendations?

I saw many are going to Laos but they have two different information on their website what documents I need and no one is answering the phone/email.

Any experience with Yangon or Kuala Lumpur?

Thanks for your help!

Lisa