Just some hints to tie things down a little.. You can easily make your tunnel network a /30 or (/29 if more than one remote address is needed) for just one laptop doing a roadwarrior setup such as that.
Then on your OpenVPN firewall rule make "source" the same as your tunnel. 10.0.0.0/30 /29 ect..
Make destination your local LAN if you only have one local subnet to worry about.
It is most likely absolutely safe to leave it as is but if your inclined to worry or just want to tinker more.. this is an option for you. ✌
Good luck!