So I am arriving in BKK on March 30 and staying at a hotel there during April but flying up to CNX for 4 days and again staying at a hotel. Should I assume that both hotels are responsible to report my location to Immigration at both locations for both ARRIVAL and DEPARTURE?

My 60+30 day SETV expires soon and I'm leaving for 3 weeks and then returning on another SETV. I have rented a room in a hotel for 6 months in total and will return to the same room (will leave most of my stuff in it). My question is upon my return, is it my responsibilityto do a TM30 or can the Hotel? If it's me, can I ask the hotel to do it or do I have to go to Promenada?