Ignition Architecture development

This picture is my ignition structure, i want to extend them to wireless mode, due to the next year i will install many sensor (collect pressure, speed, temp) in my facility
currently i install the sensor and connect them to Siemens 1200PLC, then i use the cable network connect it.
But facility sensor are not easy to wiring the cable network .

  1. I want to know , do you have some experience on extend the ignition connect to a wireless sensor?If yes, what should I purchase?
    2.If I purchase the perspective module, then it can work in the factory Lan, do you have some experience use the perspective in a public network(by VPN?)?
    Many thanks in advance.