I replied to your PM
About the Contrail...
yes you can fit two mats (and sleeping bags) into the Contrail and as long as it is set up so that the mesh slopes outward *you should be OK but you could have the outside of the sleeping bag touching a possibly wet from condensation wall.
Having two bodies and possibly blocking a lot of the air flow will increase that possibility.

The Squall will be easy for you.
* some have problems setting up the Contrail correctly.