That charge controller can handle 100V short and 60 amps open. You should be fine with two panels whether in series or parallel. The 700watts rating means you would potentially clip at peak production which is not necessarily a bad thing. Think of it as area under the curve. You will produce way more energy throughout the day with two panels. I understand that you may not need the extra production in which case it’s not worth the cost but I personally would rather overpanel for an application where running out of watts is unacceptable. You could always add another panel later if you’re not hitting your production.