dax seems to be range bound . Perhaps it will stay between 12315-12485 .
Once and twice means to divide your trade in 2 halves instead of only 1 trade - so you can easily set tp1 and tp2 (also you can set sl1 and sl2).
So sell once at 12485 , twice at 12495 with sl 12505 both and tp once in the middle 12400 and twice 12320 also buy once at 12320 twice at 12310 with sl 12300 both and tp once in the middle 12400 , twice at 12485 .