As I do my thinking about these things using
FF&S, I assume contra-grav produces no thrust. It just makes everything in a field (either a simple ellipsoid shape or one bounded by a sealed hull) weigh very little (though mass is retained). So alternate sources of thrust and directional control are required to move and to control direction and attitude.
As for what they look like - it depends on manufacturer and exact intended role. Some look like the 'IISS Grav Bike' image above. Others like:
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And, for a more radical appearance, some are the 'broomsticks' of the Reformation Coalition:
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