At first, build for testing a separate network for the Blackmagic devices with an extra router. You can use an IP area as you like, as long as all devices are located in this area. Don’t use wireless LAN for slowmotion, this is to slow, use only cable LAN. Take care for the DHCP settings of your router in the selected IP area and the fact that some of your devices have a fixed IP.

The most important thing is to switch off the HyperDeck functionality in the ATEM Desktop Software! A HyperDeck can not receive comands from more than one instance. Most of the known issues come from this adjustment.

Connect the iPad with HyperSlow via the adapters to the network router/switch, not to the laptop or computer. Connect your computer also separatelly via LAN cable to the router. All devices should be connected with a single LAN cable to the router/switch. 

Supply the iPad via the adapter and a 12W Apple power supply with power.

The HyperDecks need to be connected to a real power supply, POE is much too weak for supplying HyperDecks.