Sorry but you explain: "Not easy to get them to do TM30s from overseas, especially within 24 hours."
As a owner you can register the address and give the tenant the login and password to make the registration by themself or give it to the landlord who is collecting the rent.
IF you want to recieve rent, it is easy to follow the Immigration rules IF you want.
Okay, IF he used a Non Immigrant B visa and got a stamp with Admitted until 15 Feb 2024, he can stay until that date.
He has to make sure that his Work Permit get cancelled, ask a copy of the letter, do not trust employers to do this for you.
IF, please check the passport, he has a stamp with text "Extension of Stay permitted up to 15 Feb 2024" than he needs to visit Immmigration office with the letter from the Minsitry of Labor and employer to cancel this Extension of Stay at the last day of working.
The Work Permit is from the employee and the employee needs to cancel it, he might directly ask for legal support to get his severence payments. The Extension of Stay is placed in the passport of the employee and can NOT be cancelled by a third party.
I guess you never had an Extension of Stay otherwise you would not made this comment.
Please read and do understand the terms and conditions before you sign this form.
Nothing will be cancelled. IT is YOU and only YOU who is responsible for the documents to work and life in Thailand.
IF you get fired from the job, get the document from your employer, visit the Ministry of Labor and cancel your Work Permit using the same date as last day of employment. Than you visit your local Immigration Office and cancel with documents from employer and ministry of labor your Extension of Stay permitted up to 8th May 2024 using the same last day of employment.
IF you need some time as you need to leave the country, you might apply for a new Extension of Stay, cost 1.900 Thb and if you can NOT meet any requirement it will be NON APPROVED and you get 7 days to pack your bags and leave Thailand.
Cheap option: Visit Immigration Office and apply for the 60 days Extension of Stay based on visiting your wife, this gives you plenty of time to season your money in a Thai bank account