Tankless Water Heater Safe Location

[srburrito]

Hi all

I am doing a total rebuild of an airstream and I wanted to see if anyone had insight on where to install my Girard tankless water heater in relation to the oven/range.

Can the oven be directly above the water heater? There is enough room to give the more than the clearance required in the water heater manual, but that seems to be for the purpose of avoiding lighting anything else nearby on fire. Will the heat from the oven affect the water heater's operation or make this unsafe in any way?

Thanks!