Yeah that should be decent. It is the correct MP/sensor ratio.
Domes are not recommended outside unless it is well protected from the elements. The big issue is that the domes will hold onto water droplets much longer than a turret or bullet and thus any dirt on it can then become problematic. And during a rain event, the camera is basically blind...
The domes attract lots of dust. Then rain. Then dirty rain spots. Glare from all angles of the sun. Then over time the sun will "fog" the dome like a car headlight.
So if you go that route, try to tuck it under an eave so it is somewhat protected.
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