Do I need a TM30 to extend my STV visa in Thailand?

The short answer is you NEED a TM30 at most offices.

BUT (as always)

your mileage will vary and you should check with your office BEFORE you show up to extend your STV.

In order to get the TM30, and as the online system to file TM30 is down, can we just go in person to the main local police station (for instance in Koh Phangan) to do it?

You asked this same question on March 31

All the answers remain the same.

Supply the requirements for the extension and get it.

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Make sure you have the correct insurance for the STV visa and its extension. Must cover all the time you will be in Thailand.

Getting an extension for an STV is difficult. From a report:

I was in Nonthaburi to extend my STV visa. Here's what the officer asked...

1. Copy of passport

2. Copy of TM6

3. Copy of STV visa page on your passport

4. TM7, use the last updated one or get it from Immigration Office. With a photo affixed.

5. STM 2. Declaration that you're aware about overstay and the penalties.

6. ASQ certificate letter stating that you've completed 14 days quarantine.

7. Some kind of proof that you indeed stayed at the ASQ, i produced my ASQ hotel receipt ( room charges )

8. Health Insurance showing coverage amount, line by line items in details of IP, OP, Covid coverage amount.

9. Rental. To state clearly rental period when to when, at where, 4 signatures either passport or Thai ID at the end of agreement ( the usual standard contract ). If the rental's address is in Bangkok, you can only extend visa in Bangkok. Rental period should cover at least 3 months more.

And sign at every page."

Yes..and a whole lot more.