OK - that wasn’t as clear in you first posting
As much as I am aware, there is not an automatic restart after a power surge for the 5D. I did a quick check of the Drobo User manual online for the 5D, which did not suggest that option exists either.
A possible work-around if you are using this setup remotely is to invest in a separate UPS to the Drobo (in fact it is recommended to do so in the Drobo User Guide), with an email alert from both the Drobo and the UPS (if it comes with that facility) to identify if the Drobo has experienced a power failure. Then, if your Mac restarts automatically after the power failure is restored and within the UPS power timeframe, you should be good to go. If however the power failure goes beyond the UPS power timeframe and it shuts-down, upon power being restored and assuming your Mac can link to the Drobo, there is a Restart option on the Drobo Dashboard under ‘Tools’. If not, then I guess someone will have to reach behind and flick the switch manually.