Probably better off doing QQQ instead of the NDX if you want better fills/liquidity. But if you want to give the NDX market makers $ im sure they will let you.
curious what strategy are you using for 6 months away?
Are you just hedging your portfolio or something
Liquidity in NQ isn't that bad during regular hours (I'll get filled at midpoint more often than not) but you likely have to cross the spread after hours.
By NQ you mean NDX?