I spent a couple hours this week finding molly lineups on all maps for all common plant spots. I verified with Viper and Brim that their trajectories are the same. The only difference is I set these up on Viper and used the snake bite crosshair for about half of the lineups, which unfortunately is not the same spot in the utility belt for Brim, so you'll need to just copy the crosshair position or some other UI element for Brim/KJ/Phoenix/Raze. Also worth noting this is in 4K, so that might change stuff if you play on a different resolution.

https://imgur.com/a/gI6SDaA