I’d question whether the 45 degree option will really be optimal ergonomically. It’ll mean that it’s harder to get at the dishwasher racks from the sides while they’re pulled out (since there’s a cabinet door at a 45 degree angle to them). Particularly for loading the back of the rack, that’ll mean reaching relatively far.
I have a dishwasher next to the sink, and I tend to load it from the side standing in front of the sink. If it was at 45 degrees the door would open so that I couldn’t stand in front of the sink while it was open.
Obviously I haven’t seen your floor plan, so there’s maybe something I’m missing, but I don’t see how a 45 degree angle could make the ergonomics better.