2 internet plans, one address.

Hi, ive been wanting to know if its possible to set up two internet plans (two different Xfinity accounts) under the same address? Ive seen things online saying you can, you just need an updated address, like apartment A and B, or you need a business account. Ive also seen that you don't need to do that at all, and I'd like clarification. I just received my router, and I dont want it canceling the other internet if I set mine up.