Two Suites are possible on all routes, the only difficult ones are the routes to North America. I just got two seats to JFK from SIN.

I general they only give one seat immediately and the second seat needs to go on waitlist. If you have no status, they won't clear it before 14 days into departure. Even with status they make you wait longer now to have a better understanding of how many seats they can sell.

The other option is to book one Saver and one Standard redemption - still a very good value to enjoy Suites together.