Thank you guys for the feedback.
The zones are set up with the lawn on one system and the flowerbeds, pool, and water feature set up on the other system. That way I can manage them do they will never both be on at the same time. It is all on a well, so we are worried about water pressure if we have too much going at the same time.
I was planning on just getting a “Y-splitter”. I’ll get an extra one in case it goes out.
If sending more power to the unit is a common safeguard, do you know which AC/AC adapter people use? I’ve had a bit of an issue finding a good one.