I have this same issue but my situation is a bit more complicated
I have two curved 'eyebrow' dormers made of ply both opposite sides of a pitched roof with concrete tiles on horizontal battens.
The architect has specified single ply/EPDM for the dormers.
The apex of the curve meets the ridge about 20mm below the bottom of the ridge tile.
I'm planning to run continuous membrane from one dormer to the other under the ridge tile but dealing with the curved junction will be tricky including the triangle sections where we need small corner tiles.
I would like to use some mortar between EPDM and the concrete tiles to help keep the smaller ones in place.
Beyond the very helpful posts so far, does anyone have any further suggestions for dealing with the curved junction?