If you watch MLBtv from behind a VPN you can avoid blackouts by picking a server in a different city. As far as MLB knows, you are watching from the city in which the chosen server is located. You can subscribe to a VPN for a couple of bucks a month. It’s a very good idea to use a VPN to protect in any event to protect your privacy. Avoiding MLB blackouts is just an added benefit.
I’ve heard that Opera browser has a built in VPN. Should that do it?