You need a camera with a BT or Wifi connection to the tablet or phone. The bigger hassle is a mount that actually works with the spotter.
For all the love phoneskope gets I tried their mount for a GoPro on a Leupold spotter and it sucked hard. Wound up buying the Leupold digiscope adapter, much better mount.
You can then record and view via WiFi through the spotter. So my advice is, find a good mount designed to work specifically with your spotter.