Rather than having both units plugged into 1 master, you link them. You can also control the flow rate of each pump individually that way. They will alternate every n seconds as you specify still, but you can control the flow of each pump as well. You can wirelessly sync up to 4 I think. As far as I know, the RW series pushes more flow than the WP series, but its hard finding charts. Of course, I havent looked super hard either.
Question i do have. Say you have 2 tanks in proximity to each other. Can you have 2 distinct Jebao RW series systems independent from each other?