I recommend you use PEPv2 if possible and you don't want to use Overlays as the PEPV3 software was beta and had some memory leaks which could cause you to lose changes in a config. You can still use the latest TSU9600/RFX9600 firmware but stick with PEPv2 as the editor.
For your 2nd question, HTTP and not HTTPS is possible and I would recommend you start a separate thread for that.