The Nighthawk isn't going to be much more capable of penetrating solid walls/metal framing. it will be using similar Wifi5 technology running at similar power levels.
Even if you opt for a model that has Wifi6, it will still be subject to the shorter 5GHz wavelengths that don't tend to travel through obstructions too well. You may have more success with a multi-point mesh model.
Regardless, exercise caution before shelling out on an expensive aftermarket device. Wiring additional Wi-Fi access points to your main hub for the blackspots is probably one of your most reliable options.
Bob Pullen
Plusnet Product Team
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