One of the more challenging aspects of orienting parts like this is PreForm doesn’t adjust for support intersections. The supports that intersect through parts will be a bit more challenging to remove, and will likely need to be cut away. These look like relatively flat parts, so that might not be too much of an issue here.
Generally, increasing the X/Y cross-section of your parts will optimize for print time, and increasing the Z height of your parts will optimize for part packing.