Arcaydian NH20A, Boost 2.1 and my own router - muliple wifi networks

[wireless]

I have my router in port 1 (Lan) of NH20A and using my original wifi networks for all my devices.
I installed the Arcaydian Boost wifi 6 in the 2.5gb port of the modem and it seems to be working well as well and has the wifi network that came pre-installed on that. I read the forum of using the NH20A in Brige mode but I did not see in the admin panel what if, anything nedded to be done. Everything is working well from what is see.

So what's my question - Is there anything else I need to do ?
Can I setup new networks on the wifi boost and does it support 6G of wifi ?
I have 1.5GB configuration, and getting close to 1GB Upload from my laptop dethernet connected to the router but only close to 500mb Download. What can I do to improve this ?

Thank you for your help



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