No. Connecting to a safe VPN covers all the possible functionality that a proxy may offer. Which is to say, it hides your IP address and physical location by masking it behind the IP address of a VPN server. So if you have a safe VPN, such as VPN Unlimited, you already have all the same bases covered, AND you get a host of additional benefits, like data encryption and privacy protection. Adding a proxy to the mix would be unnecessary.