I just hope you can find a friend near by or nice neighbour who can be trusted, and to check on them daily (a couple of times a day if possible!), I am sure your boys will be much happier and feel more secure in their own home. In addition to being without their meowmy, but if they had to be stuck in somewhere strange, I think they will be very stressed. If a cattery is the last resort, you would need to do some checking and it is of quality and your boys will receive a deserved attention and care.