If you buy a house from Lennar, they'll tell you that you have no choice but to use Carpets N More for your flooring. Don't do it. Because they think you have no other place you can go, they'll act like they own you. Everything is overpriced. Service is atrocious. And their work is horrendous.
You should just let Lennar install their basic flooring so you can close on your house without paying any extra. Then right after you close, find a better flooring company and hire them to rip out the flooring Carpets N More did and install your new flooring the right way. It'll be cheaper and less of a headache this way. You might have to delay moving into your house for just a little bit but it will be worth it. Unless you just want to have a floor where every other tile is chipped and/or have lippage issues, you shouldn't give Carpets N More a dime.