Savings plan execution time / executes before reference market opens (bad price)

Why is there no choice for the time or at least some reasonable default for when a savings plan executes its orders? Buying US/Canadian stocks at e.g. 2pm German time just lets you overpay tremendously because of the wide spread.

Wouldn't MiFID II require investment firms to take all sufficient steps to obtain the best possible result (best execution) also for periodic savings plan orders?