As far as I know nordVPN should be compatible with openVPN client which is opensource and should be available for most devices. Even if you don't install their software or open VPN client you would have to setup the VPN, if it is your home network you could see to set up the router so all devices go directly thought VPN.
You can take a look at VPNs listed on this website:
https://www.privacytools.io/#vpn (other than VPNs it provides good range of private tools/services you can use).