Do I need to submit TM30 for my own stay as a condo owner in Bangkok?

The TM30 reporting requirement typically applies to landlords or property owners when foreign guests stay at their property. Since you are the condo owner and will be staying at your own unit for 12 days, you do not need to submit a TM30 for yourself. The TM30 is intended for reporting foreign visitors staying at a home, not for the homeowners themselves.