You cannot get Non O in your home country. You have enter Thailand on a Tourist Visa for 3 months to get it and you need to deposit 800k baht into a Thai bank account. Outside of Thailand you can only get a Non OA Visa with funds in your countries bank account and need to also get a 100k USD health insurance policy requirement.
What country are you from ? ......get on Google and look up your countries Thai Embassy/ Consulate. All the information relating to what are the requirements to get a Visa for Thailand will be on there,....as is the required ID/documents/statements and applications forms to fill out.....good luck.
RT-PCR test is the most widespread, mis-used, inappropriate diagnostic instrument in history and was never meant to be used as a tool for SARS Cov.2 (Covid-19).
At this point they could be looking at any number of viral infections the person had from the past or present and achieve any result they want to portray by increasing or decreasing test cycle thresholds. Kary Mullis, the inventor of the test would be bitterly disappointed with it's mis-use, if he was still alive. Unfortunately he died in 2019.
I went through ASQ process to come to Thailand. I was tested in Australia within 72 hours of flying out. I got to the hotel in Thailand for 14 days solitary confinement. Constant temperature, blood pressure checks and 2 further RT-PCR tests in quarantine....how the hell are these foreigners slipping through all these requirements and returning a positive result.