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For faster engine warmup, you'll want to block the upper grille. The upper grille provides airflow for engine cooling. The lower grille helps cool the inverter, and also some engine cooling. Running the inverter hotter (i.e. with a lower grille block) will probably reduce its efficiency.
I think there are some aero gains to be made on the underside. The car comes with some underside panels, but they're far from perfect. For example, the entire passenger side, behind the rear wheels, is left open. I'm guessing they didn't want any plastic panels anywhere near the exhaust. But some heat shielding should help with that.
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