I would not recommend doing this. Risk of toxic metals as the plates break down, gives falsely inflated o2 levels with a DO meter. These are a gimmick.
I bought an O2G 2020 but have not been able to put it through a full grow. It does have a built in timer to prevent O2 levels being toxic. I combined it with a low pressure pump on a separate timer to circulate the nutes every 1-2 hours as the O2 is said to stay in the nutes at least that long. So far, still stuck with airpump/stones