Assuming your 'home has the 50A (240/120v) cord and plug setup, I'd look at installing one or two "kickspace heaters" that operate on 240 volts and hard wire them to the circuit breaker panel.
Like this:
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https://www.acwholesalers.com/Dimplex/CKHA20D31W-1800-Watt-Kick-Space-Heater/39363.ac?gclid=CNbDqMLuscICFYeBfgodHnQAiQ
They are made to install under kitchen/bathroom cabinets so all you see after installation is the grille.
Advantages are no freestanding unit to trip over, hard wiring eliminates worry about the adequacy of existing circuits/recepts, quieter than a lot of portables and a nice clean installation. 240 volt operation allows for higher wattage outputs as well.