I have a 110 litre tank, have 6 neon tetras, 3 swordtails and 3 platies, will they mix with....?

I would steer clear of 2 gouramis, if they were to breed you'd have a menace of a male gourami on your hands. Anyways, the cory cats should work, and maybe 5 amano or 8 cherry shrimp too. They like moss, such as java. Adding another shoaling fish might be a bit much, so maybe add your cory cats, 1 male or female gourami, and the shrimp of your choice.