Using to different packs of Orbi together

Hi,

I am hoping for some advice, please.

I bought 2 packs of 3 Orbi RBK53S. Having received them I have found that the packs contain 1 router and 2 satellite units, although it says this on the advert I hadn't realized this was the case. I have been used to BT Whole Home Wifi where any unit can be used plugged into the router. I spoke to support and they have told me that the router from the second box can not be used as a satellite extender. This means that across the two boxes I have 2 routers (1 redundant and therefore unusable) and 4 satellites, (whereas I need 5).

I have now started to get concerned that as these are sold as a pack containing a router and two satellites, will the satellites from the second pack speak to the satellites from the first pack? I don't want to open the second box to test it and find out when I might be returning them.

So to summarize, my goal was to buy two boxes of 3 and have  5 satellites plus one connected to my router. I now think the best I can get is 4 satellites and 1 connected to my router and purchase 1 extra satellite to make the required 5.

This is what I purchased from Amazon

https://www.amazon.co.uk/gp/product/B07T4CJBDG/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

Many thanks for any help you can give me.

Shaun