Thanks! A bit different than Screenflow but would work I guess.
In Screenflow you select the screens/webcams you want to record and each screen is later available as it's own feed so in post you can resize and switch between the screens as you like. Brilliant piece of software.
In OBS it seems that you can switch between scenes while recording son it's more of a livecam setup and editing while recording. Will take some practise but I think it can work for me.