I am trying to set up NordVPN on system which comprises a Virging Media Hub 3.0 (running in modem mode) and an Archer AX73 router 

I have several devices connected to the router, some via wifi and some via ethernet. Some of these I wish to rout through the VPN and others I wish to pass directly to the web.  Under VPN Client/Device List I have set up and activated all required devices.

I will not be connection to my local network from the web.

I have read endless artlicles on VPN client mode versus VPN servermode but I am stlii not really sure which is the best mode to use. 

I do understand that if I use the client mode no extra software is needed on the deevices passing through the VPN; whereas with VPN client eacg devive will need specia software.

My questions are theses

1. Which mode is best for me?

2.Do I need to activate both modes on the router or just one of them?

3. Will it matter if both are connected at the same time?