[Crowbob]

Soaker hose will be fine. Arbs, especially these, don’t take much care or water once they’re established, and these are facing east so not much hot afternoon sun.

These can also be pruned to very precise shapes. If you want the tops to be even with or slightly taller than the fence, and flat, like a tall manicured hedge, you’ll want to clip the tops off a little lower than you want the mature height to be. If not, just let ‘em grow.

If you want the row to be a uniform height, I’d suggest topping the taller ones near the top of the second pic a few inches to let the shorter ones catch up. That’s a good place for those evergreens. They’ll like it there.