As professional catsitter i would say get someone in once or twice a day to feed, fuss and check on your puss cats. Pity I was not in the same country as you as i would love to help you out with your furry felines! I charge £10 for 1 visit a day and £18 for 2 daily visits- prices are in UK sterling (not sure how much that is in dollars??)
Less stress for your cats and for you if they can stay in their own house/environment.