Dab and dot / edging round door recess

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currently I have a wall that contains a door recess of about 8" deep. I need to plasterboard the wall and the recess. Clarelr where the wall joins the recess there is a 90 degree corner which I will have to but up the plasterboard. As both wall and recess will be dabbed and doted, do I need to put wood behind the 90 degree corner to support it.

If not, what do I screw the angle bead into ?
 
Or stick the beads on with finish when you first mix up and start furthest away from the beads so you get to them last so they have chance to pull in and stick properly.
 
What @Pug said.....staples....gripfill is a godsend for formed corners
 
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