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Those two fish shouldn't have any issues with each other. Blennies are most aggressive towards other blennies and I find lawnmowers to be a bit less aggressive to other fish in general as well. Might be a different story if it was a Starry Blenny or a Molly Miller Blenny since those two are a bit more aggressive.
Lawnmowers shouldn't pick at LPS corals but if there is algae on the skeleton of the coral they will go after it and might upset the coral in the process. I do know that they will steal food from corals if you give them the opportunity.
I've been hoping to do this with my 35 gallon when its set up next month, tell me how it goes

