Do I need my landlord to sign something for the TM30 notification of residence upon returning to Thailand?

My wife owns the condo and I have brought the TM30 by myself before without any problems or require power of attorney. Nonthaburi Immigration.

a New one for me, Thanks for the info.

in Si Racha immigration they ask that

I never heard of a power of attorney is needed to fill out and report a stay at private rented address. The enforcement of reports is indeed different at offices, some don't care, some only when re-enter Thailand, some only if you change address and some want every move longer than 24 hours. This is from the translated text about who can make the report: "According to section 38 of the 1979 immigration act, "House owners, heads of household, landlords or managers of hotels"

not all offices follow same rules

If you have a lease or rental contract you are seen as the house master and can do the report.

It still depends... In Jomtien you can do it yourselves, no landlord needed. But I don't know what Samut Prakan wants. :(

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Last visit at Immigration it took the officer 10 minutes to check the address and fill all the details in the database. I guess you will be more than happy that they don't let you wait 10 minutes a person when you arrive with a full airplane at the airport. About 300 people in line, 10 minutes each, that will be about 50 hours in line to enter.