Adding new line (Anti-Syphon valve)

I am trying to add a new line to my 6 zones anti syphon valves. My timer is maxed out (has 6 controllers only) and was wondering what would be the most efficient and economical way to do this. There are some solar anti syphon valves in the market, but not sure about their reliability.
My options would be to change the timer into a timer that can take up to 9 controllers or to use a solar anti syphon valve. Any other options?

Also the mainline that I will be using to connect my new valve is going into a faucet, can I use that line to connect into my valve with a simple T fitting without tapping off my facuet?