I figure you'd want it inline with your heater bypass hose. The lower radiator hose is on the wrong side of the thermostat.
Inline with the heater core would be okay, but you don't want to spend too much electricity heating the cabin, and you'd have a problem if you parked with your climate control set to "cold".
If your existing heater core bypass plumbing is inaccessible, you could always put a T on the heater core input and output lines, and install the heater between them, right?
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