What should an employer's letter include to confirm remote work for a Thai visa application?

Hi there,

I am from Singapore and currently working remotely. I had read online below required documents.

1. Valid passport

2. Financial proof of 500,000 Thai bth in bank

3. Proof of residency

4. Letter from employer indicating that you are able to work remotely.

May I check, what are the details needed to be written in the employer letter to prove that you are able to work remotely? Also, which country did you all applied in and which agent charges a decent rates with high application approval rates?

Would below details will be sufficient and signed by head of department?

This letter is to certify that xxxx employee is being employed as a sales coordinator since 2022 and had been working remotely since being employed. He may work remotely in Thailand during his working hours.