Software engineer - Rights place to hire

Hello,

Here's up to 10 years since my subscription to this forum,  i m happy to come back here, i will be in a medium term one of us 

i'm IT manager from a company (HR management,...) of 50 employees in Europe, my company plans to open  an IT department in Thailand.

Married with a Thai National  since 10 years my boss has proposed me to be the Manager of this department. Of course I can't miss this opportunity, i can realize a dream planned for the retirement 

We will looking for a first step to hire between 4 to 6  senior/middle software engineer in .NET (Thai National)

I have the totally choice about  the place to setup, Bangkok, Phuket, Chiang Mai,...

I Know  Bangkok and Chiang Mai won't be a problem to find some good programmer.

My question is about Phuket (not a big city, all at proximity, international schools for my son,....), i see really few job offers comparing Bangkok.

Can anyone could know the potential to find the right candidate in Phuket province. It will be helpful to choose the right place  

Thanks in advance for your answers

Regards