I'm sorry to hear this, what a hard situation. Is there any way you could put them in a large dog crate or something while you are away? You could put food and a litter box in there, and if they didn't go in the litter box it'd still be in the crate not in the floor. That way you wouldn't have the expense of boarding either, and when you are home you could let them out and watch them. Just a suggestion, I hope everything works out for you, Kimi, and Maya.