In fact, I'd confine myself to a bank vault or a guru's mountain top sanctuary.
The term Euboea did not designate the eminence upon which the Heraeum is placed, or the mountain-top behind the Heraeum only, but, as Pausanias distinctly indicates, the group of foothills of the hilly district adjoining the mountain.
For example, atmospheric pressure is greater at sea-level than on a mountain top.
repeater system on a mountain top which is meant to cater for stations in valleys.
Not a good choice for a repeater system on a mountain top which is meant to cater for stations in valleys.