Hi S.,
I had my twin boys when my older son was 2. So I understand the difficulty in feeding the twins. Here is what I did during many day time meals -- since we are in Sunny FL -- I took them either to Zoo or Busch Gardens or any park, so they were not focussed on food and using the food for entertainment (and understand Gravity -- throw and see it fall). They ate outside even in the yard, sitting in stroller, that I hosed very often and many times put thick towels or plastic cover. That reduced inside clean up stress. I let them eat something on their own at dinner time, and feed them the messy things by myself. I was lucky that my older son was around 4 then, and he played with the boys when they ate. I remember crying many times with exhaustion and seeing the mess in front of me .... this time will pass and as parents, you will always have challenge, just the nature of the challenge change. Oh, one more advice, if I give my kids something to eat, they knew to eat it until they are full -- if they threw all the food, that meant go hungry till next feeding time (yes, lots of crying and noise..), but in a week, they learnt their lesson and only threw the things that they really did not want to eat. Do not pick up any food for them from the floor as it becomes a game for them and you will be trapped. My twins are 6 now, and still know to eat when and what is served, or they can wait two hours and get something else then. They may not like everything that I make, but the rule I established that if I have cooked it and it is eatable (may not be great), you should be thankful for the food and eat it. Not all the time you would have the food of your choice.
I am so glad that I was able to force this rule when they were young, as people ask me all the time "How your kids are not fussy when eating" -- they can say politely that they do not like the food and take smaller portion of it to fill their tummy, but they are not getting anything else till next meal time.
But throwing and making mess for kids is normal .. so don't get too stressed out and try to enjoy the kids also, rather than just worrying about mess (I read it somewhere as I was a clean freak before my twins arrived -- Bless this mess because I have kids -- and it is so true -- I clean what I can but I really enjoy my kids and my time with them).
Take Care.