rail kit

I’m wondering if the rail mount for the AI Primes would be able to just have one light on it. I only have one and only want one and I prefer the rail option, would I be able to center one light on it?

I am selling 2 Ecotech Marine Radion Xr30 2nd gen, with a short rail and hanging kit for $600. They are both in perfect working condition and have never been run above 65%. Will do local pickup or buyer pays shipping.