What is a TM30 and do I need to register it upon arriving in Thailand with an e-Visa?

You seem to be confusing standard procedures.

*** a TM30 is the registration of your arrival and presence in an accommodation.

It must be submitted to the TM30 online system of the Thai Immigration, or on the physical presence in the Immigration office, by the landlord or hotel within 24 hours of the arrival of you in the premises. If you or your landlord misses it, you can get fined 2000 THB at the Immigration office.

While in theory the landlord or the hotel must pay the fine, it is always you who has to pay before you are allowed to leave the office. Then you need to get lucky to get your money back.

*** and only if you are already properly registered by a TM30, you can visit Immigration and apply for a “certificate of residence”, for a touristic 30-days extension or for a “1-year extension of stay”

The following question comes up a lot and in theory (at least how the rules are written) yes, you file a new TM30 every time you return from abroad even if you are returning to your same residence

BUT

In practicality it's much more dependent on the immigration office you use.

Some say as long as you're coming back to your primary residence (the one you use for extensions/90 day reporting etc) that you do not need to refile a new TM30

BUT

Some stick pretty close to the rules and say yes, you must file a new TM30 every time you return from abroad no matter if you're returning to your same address or not

If you have the eVisa and have no intention of getting an extension at immigration then you have no need of a TM30.

The TM30 is lodged by your hotel or landlord to identify a foreigner staying at their premises. You only need it if you want to get extensions or other changes to your visa. Most tourists don’t even know it exists.

You don't need to do anything unless you own the property where you're staying

Yes if you do an extension you do need it to take to immigration.

Ask for a copy as alot of places don't actually do it, I submit and send copy to renter.

Wow... let's see what Gemini say...AI is such a crazy thing

Let's Thailand know that your staying where you said you would be on your visa. Hotel does it for you, otherwise landlord sets it up and you report it each time you enter Thailand. 😉

It's something your landlord/hotel does within 24 hours of your check in