Use Resolve FX Transform. Composite your FX and track from the edit page.
00:00 Intro
00:08 Empty Timeline
00:41 Preview the Multicam Clip
00:51 Verifying the Multi Cam Sync
01:42 Base Edit for Multicam
02:45 Changing your audio source
03:38 Editing the Multicam - Live
04:29 Slip Editing your Multicam
05:08 Swapping Angles