But they can require things of devices connected to their wifi or being brought to their premises. You are welcome to leave the device at home if you don't want to consent.
Depends on the local laws. Where I live, they can either deal with it, or provide a secured storage space for the duration of the visit.
Either way, if a corporation wants their employees to use a device, they are obliged to make one available. Surrendering your private equipment to their management makes it not yours anymore.
