Yeah, most VPN providers like to be vague to avoid getting held accountable for configure everyone's router. There's so many variable / variations in each vendor it's impossible to support them.
Most routers you buy off the shelf only support whichever one paid them to be added into their GUI. If you hack the firmware you can generally apply options yourself outside of they they provide out of the box if you want to use it as a central / whole network VPN.
Doesn't look like this specific router has a WRT option though at this point. It should run fine on your laptop / PC though using WG for faster speeds if you're tired of going slow while connected. I've been using nord for ~4-5 years now and it's the only one I can deploy as a central VPN to cover the whole network on my DIY Linux router setup w/o compromising security to get it to launch / connect on reboots.
Using it as a central connection cuts down on the need to have multiple logins per service unless you have a lot of people that need protection on the same plan.