Forming Corners on Ashlar effect Mono

Hi folks,
What is the best way to form corners when doing Ashlar effect monocouche? We're doing the bottom band of 2 pairs of semis and the render goes all the way round. For obvious reasons we can't use beads and if we form them with a darby or timber then there will be a visible seam where we join up to it when doing the next elevation.
Any advice apreciated.
Thanks, Andy.
 
You can still use beads just cut a few mm short from bead otherwise use timber with a 45 degree planed down one side this stops the seam
 
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