For your information, it used to be in KoW 1st edition that individual could be put on round base (you can still see many pictures of the offical Morgoth the Faceless model on a round base for exemple) because individual made facing not matter for them.
However it happened that there were some rare situations where it became a problem, especially when the charger had no facing restriction, so could charge the individual from any angle he could reach, resulting in some situations not in line with the usual charge restrictions ("what do you mean your flier can jump over my unit and charge my army standard hidden behing it from an angle that not only make the charge possible but also allow them to both kill the hero and overrung the unit ?!")
There are also a few situations where the facing matter, for exemple individual with ensnare or phalanx won't benefit from it if charged from a flank (can happen in some situations)
In your case the problem is lessened due to the fact that you use an oval cavalry base, and not a round one, so flanks can still be determined more or less most of the time, but it still opens the potential for confusion in some extreme cases.