In my 10G I have a titanium tube heater right below the tube intake into my HOB filter/refugium (it was too big to fit in the HOB). That way the "heated" water rises into/gets pulled into the intake and gets dispersed throughout the tank.
Since it doesn't sound like you have a sump, behind your rock so it is hidden. You want your rock set away from your glass anyway for flow. Just make sure you have good flow on the heater.
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