Generally when we refer to application services we mean deployed instances of a business application, so WiFi doesn't seem to meet that definition on the surface, but if what you mean is "WiFi device support" then yes, you can use a special subclass of application service called Dynamic CI Group, whose purpose is to collect similar CIs and surface them basically as a connected system, which would then connected to the WiFi management technical service offering.  The Dynamic CI Groups could be created to collect CIs based on the CI class, the environment type, or any other criteria you define, so yes you could definitely have two DCGs called WiFi Production and WiFi Test.  Note, however, that if they are both connected to the same service offering, then the contained devices will be supported by the same Group.  If they are supported or managed by different groups, then you should define them as different Service Offerings.