I have heard all that too. I think you will find that Bill and I both disagree with the "Popular" ideas about toe out to help engine out. We both go with "point them straight ahead" or 0 degrees toe.
Now, as I tend to push the envelop a bit......(OK A LOT!!!) I have found that some of the bashed planes, I have had to add down thrust to vertical climb and my poor attempts at hovering, but that is to compensate for the plane pulling on vertical climbs.
If you try to angle the engines out to compensate for thrust of only one engine, the angle will be very high.
Concentrate more on larger rudder, with large deflection capability and long tail moment, both for stability.
What are you building?. If this is some sort of Bash, consider to hold off mounting the firewalls a bit. Install the radio and servos everywhere.If the covering is heavy, might consider to cover it first. Bolt the engines, with mufflers, to the firewalls. Now, using rubber bands or similar, move the engines forward and back to achieve balance before gluing in the firewalls. Save a bunch of added weight to balance the plane.
Good Luck,
Twinman