In a previous company on 737, A320 and A330 the iPad EFB was held in a suction mount on the side window. Destroyed the window shades quite fast if pilots were not careful. Seen several other installation, including aircraft fixed mounting systems (require certification unlike the suction mounts as those are a change to the aircraft) including power delivery, usually on the lower part of the side window, in no case installed that they would interfere with the opening lever at all. Best one was easily rotatable from landscape into portrait mode which is quite nice for displaying approach charts.
Sadly, not all apps do allow split screen use, could be especially useful to have the charging app on one side and the OFP on the other in cruise, or charts on one and performance calculation on the other.