We fly EC135. In the single stretcher configuration (which is 80%) of the time, we allow the paramedic the option of alongside the patients upper body section, or from ahead leaning over the head/chest of the patient. The latter is the preferred option for them because they can easily do the paddles. The side option makes it easier for CPR.
In the two stretcher config. we can only do the ahead option for obvious reasons. I don't think it matterstoo much which angle the paramedics come from as long as they can get to the head and chest area.