, well if you travel to other cities and spend the night there... then TM30 is necessary when you are back home :-) ... or you can do as I do, book hotels via wifes Id and nobody knows you have been there :-)
I can not give you exact answer but last year I did it there.. what i noticed was , they wanted dubble copy of everything and needed wittness for interview just to have chat and make sure I and my wife are really marraid. All in all they were nice an I had no problem.
This year it will be CW for me as I have moved to new place.