I thought this might be helpful for anyone who is arriving or planning a visa run soon.....
For anyone who is wondering where you can get the 2nd PCR test done on day 5 once you're in Thailand, here is the link to all the hospitals that you can go to that are accredited by the government. As you will see there are a few places in every province so you don't need to worry about where to get it done or having to stay or come back to Bangkok or Phuket to get it done
TLDR : Answer Summary
This post provides information on obtaining the second PCR test required on day 5 for travelers in Thailand, including a link to accredited hospitals across various provinces, ensuring ease of access for those in need of testing.