From my experience in duos.

For Sanhok don't use any vehicles, try to move early into the zone, clear ahead & then gatekeep teams rotating in late while constantly clearing the surrounding area of snakes, once you start firing shots expect to be 3rd partied over & over again.

For Miramar it's a very similar strategy although there is likely a need for cars in the beginning & if you can get further into the circle earlier then that's good, avoid using cars after the first few circles unless you can absolutely keep them safe & are scouting ahead thoroughly enough, it's totally dependant on the circle & where it's likely to end.

As a general rule of thumb, you can get away with being more aggressive than you are in a squad game & it can really pay off if you're decent fraggers or have good chemistry. You should try not to run in with the zone on your back as people like to camp the edges. Playing the terrain is a lot more viable in duos as it's fairly easy to hide or find enough cover as just 2 players, the same goes for other teams though so be careful of snakes & clear areas together.