I would prefer to use a single OpenVPN wich i could configure to specific needs like tap for broadcasting and dhcp in the same lan range than take the risk to face strange interferences from 2 services doing almost the same.
For a guide there is one for MBL:
My linux knowledge is still very limited to discern the possible adaptation if needed to MyCloud.
Maybe you can put some light on this.
My current approach is to enable openvpn server in my router and disable wd ones in MyCloud.