1. There is no regulation regarding the immigration act to report foreigners leaving the address
2. That totally depends on the local immigration office. Some require you to do it every time you are back from abroad, some don't.
3. Tm 6 arrival/departure cards are currently suspended for only travelers entering Thailand by air.
4. TM 30 form is named "notification from for House-Master, owner or possessor of residence or hotel manager where alien has stayed". So one or all of them have the responsibility to report TM30.
Please refer to these posts by
@T**
about how to report if you are not a landlord. Those posts are dated old but still legit in Bangkok.
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