I'd like to place a single order across 2 instruments (one is an inverse of the other). There would be a vert call spread XYZ and another on ABC. Is it possible to do that in a single order so that it only triggers if the total price is met?
Can you elaborate on those two? I've never heard of this distinction. I assume you mean the various types of TWS / IBKR orders - icebergs, conditionals, brackets and all that by Broker Order? If so, which order type allows the marriage of two different ticker instruments into a single order?