Just make sure that you configure the DHCP range on your router to be different than the DHCP range in OpenVPN (the "server 10.8.0.0 255.255.255.0" directive would change). by using the same network, ...
I'm trying to get my Linux install to utilize OpenVPN with ExpressVPN, but without it forcing everything over the tunnel/to their settings so that my local resources continue working. I'm part way ...