What sort of redundancy are you looking for? You have HA pairs, HA Clustering, route redundancy if you wanted to fully license two separate boxes outside of HA pairs, or just templating if you have a cold spare unit that you want to keep the configuration up-to-date on.
If they're both connected to the same switch and the switch fails you'd have an outage. Generally how you would fix this is simply having the HA pair and adding switch redundancy. Unfortunately without a second switch there's not much you can do to eliminate the switch being the single point of failure.
Do you have another switch in the environment that you could migrate one of the units to to remove the single point of failure?
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