An Amp bonded to the Arc will drive two speakers as surrounds.

I would use a second Amp to power the other four, they could play alone or added to the Arc set for streaming music.

This is covered in quite a few places, but it boils down to this:

The Arc Ultra is wired to the TV’s ARC or eARC port with the supplied HDMI cable.

The Sub and the Amp driving your surrounds need to be set up and end up being connected to the Arc Ultra via an unseen 5Ghz connection. The controller application will guide you through this installation.

The extra pair of speakers will need their own Amp, which, like the Arc, can either be wired to your router or just connect to your WiFi. Again, follow the instructions in the controller application to ‘add a device’.  Note that while both rooms (zones) will be synchronized when streaming, there will be a 75ms delay between the Arc’s ‘room’ and any grouped ‘room’ when playing anything from the TV..

Thanks both very helpful. I think that means I am ordering the right gear

Will the extra pair of speakers with a separate Amp be able to utilize the same Sub?

No, a Sub is assigned to a single Room.

okay so there is no way to share the sub across two rooms?

You would need to “remove” SUB from the first Room then “add” SUB to the other Room. The reverse process brings SUB back to the first Room. By the second day you’ll decide that this is very time consuming and not practical.

Note that an AMP’s subwoofer and Line-In capabilities are disabled while AMP is used to drive surround speakers.