Of course higher leveled is always better from a survivability standpoint (although at some point the marginal gain isn't much), however, you asked how many one should have. In other words, how many are necessary and you can get by with the number Klashikari's named. If you have the possibility, level up as many as you can, no problem. Without counting any Mutsuki-class I got 17 DDs above level 90 and 31 above level 80.
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