I would mull them and make sure your window salesperson, contractor and installer understand what you want the final installation to look like.

We had some miscommunications in our build and ended up with windows that were much further apart than what we wanted or expected. Once we noticed it was too late to go back.

If I am understanding, you want (8) 48" wide windows (not storefront) mulled. So 32' long. Think about the size of header, getting and installing that behemoth.