Can't install xposed framework in cyanogenmod 12.1 nightly-flo

Installed latest cyanogenmod 12.1 nightly Flo in my N7 2013. It's super fast, visually stunning and most importantly no lag is seen what is often a problem with stock lollipop updates. BTW I can't install xposed framework. Tried latest 5.1 modules in recovery and xposed framework alpha4 apk. But it does not support here. Can you guys please help me?
N.B: xposed framework is the future of Rooted Android :)